[INFO] cloning repository https://github.com/JedCPT/rust-monkey
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/JedCPT/rust-monkey" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJedCPT%2Frust-monkey", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJedCPT%2Frust-monkey'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e058e7ffef73921326c5cf1473dc3a8663ef52ce
[INFO] testing JedCPT/rust-monkey against 1.60.0 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FJedCPT%2Frust-monkey" "/workspace/builds/worker-37/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-37/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/JedCPT/rust-monkey on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/JedCPT/rust-monkey
[INFO] finished tweaking git repo https://github.com/JedCPT/rust-monkey
[INFO] tweaked toml for git repo https://github.com/JedCPT/rust-monkey written to /workspace/builds/worker-37/source/Cargo.toml
[INFO] crate git repo https://github.com/JedCPT/rust-monkey already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2901d6d808dcc31057caf0faba08c96b686a26c70180713cd917c797bc185a8a
[INFO] running `Command { std: "docker" "start" "-a" "2901d6d808dcc31057caf0faba08c96b686a26c70180713cd917c797bc185a8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2901d6d808dcc31057caf0faba08c96b686a26c70180713cd917c797bc185a8a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2901d6d808dcc31057caf0faba08c96b686a26c70180713cd917c797bc185a8a", kill_on_drop: false }`
[INFO] [stdout] 2901d6d808dcc31057caf0faba08c96b686a26c70180713cd917c797bc185a8a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9d63aab5945af315c9cead150aef03d8cbdc9281634c8c624ae95ed414a84f85
[INFO] running `Command { std: "docker" "start" "-a" "9d63aab5945af315c9cead150aef03d8cbdc9281634c8c624ae95ed414a84f85", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling maplit v1.0.1
[INFO] [stderr]    Compiling downcast-rs v1.0.3
[INFO] [stderr]    Compiling rust-monkey v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast/mod.rs:68:20
[INFO] [stdout]    |
[INFO] [stdout] 68 |     pub value: Box<Node>,
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 68 -     pub value: Box<Node>,
[INFO] [stdout] 68 +     pub value: Box<dyn Node>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast/mod.rs:74:20
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub value: Box<Node>,
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 74 -     pub value: Box<Node>,
[INFO] [stdout] 74 +     pub value: Box<dyn Node>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast/mod.rs:79:20
[INFO] [stdout]    |
[INFO] [stdout] 79 |     pub value: Box<Node>,
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 79 -     pub value: Box<Node>,
[INFO] [stdout] 79 +     pub value: Box<dyn Node>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast/mod.rs:84:29
[INFO] [stdout]    |
[INFO] [stdout] 84 |     pub statements: Vec<Box<Node>>,
[INFO] [stdout]    |                             ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 84 -     pub statements: Vec<Box<Node>>,
[INFO] [stdout] 84 +     pub statements: Vec<Box<dyn Node>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:105:20
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub right: Box<Node>,
[INFO] [stdout]     |                    ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 105 -     pub right: Box<Node>,
[INFO] [stdout] 105 +     pub right: Box<dyn Node>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:110:19
[INFO] [stdout]     |
[INFO] [stdout] 110 |     pub left: Box<Node>,
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 110 -     pub left: Box<Node>,
[INFO] [stdout] 110 +     pub left: Box<dyn Node>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:111:20
[INFO] [stdout]     |
[INFO] [stdout] 111 |     pub right: Box<Node>,
[INFO] [stdout]     |                    ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 111 -     pub right: Box<Node>,
[INFO] [stdout] 111 +     pub right: Box<dyn Node>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:116:24
[INFO] [stdout]     |
[INFO] [stdout] 116 |     pub condition: Box<Node>,
[INFO] [stdout]     |                        ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 116 -     pub condition: Box<Node>,
[INFO] [stdout] 116 +     pub condition: Box<dyn Node>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:117:26
[INFO] [stdout]     |
[INFO] [stdout] 117 |     pub consequence: Box<Node>,
[INFO] [stdout]     |                          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 117 -     pub consequence: Box<Node>,
[INFO] [stdout] 117 +     pub consequence: Box<dyn Node>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:118:33
[INFO] [stdout]     |
[INFO] [stdout] 118 |     pub alternative: Option<Box<Node>>,
[INFO] [stdout]     |                                 ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 118 -     pub alternative: Option<Box<Node>>,
[INFO] [stdout] 118 +     pub alternative: Option<Box<dyn Node>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:123:32
[INFO] [stdout]     |
[INFO] [stdout] 123 |     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stdout]     |                                ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 123 -     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stdout] 123 +     pub parameters: Rc<Vec<Box<dyn Node>>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:124:22
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub body: Rc<Box<Node>>,
[INFO] [stdout]     |                      ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 124 -     pub body: Rc<Box<Node>>,
[INFO] [stdout] 124 +     pub body: Rc<Box<dyn Node>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:129:28
[INFO] [stdout]     |
[INFO] [stdout] 129 |     pub arguments: Vec<Box<Node>>,
[INFO] [stdout]     |                            ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 129 -     pub arguments: Vec<Box<Node>>,
[INFO] [stdout] 129 +     pub arguments: Vec<Box<dyn Node>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:130:30
[INFO] [stdout]     |
[INFO] [stdout] 130 |     pub func_identifier: Box<Node>, // ast::IdentifierExpression
[INFO] [stdout]     |                              ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 130 -     pub func_identifier: Box<Node>, // ast::IdentifierExpression
[INFO] [stdout] 130 +     pub func_identifier: Box<dyn Node>, // ast::IdentifierExpression
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/enviroment/mod.rs:23:39
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub variables: HashMap<String, Rc<Object>>,
[INFO] [stdout]    |                                       ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 23 -     pub variables: HashMap<String, Rc<Object>>,
[INFO] [stdout] 23 +     pub variables: HashMap<String, Rc<dyn Object>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/object/mod.rs:59:22
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub body: Rc<Box<Node>>,
[INFO] [stdout]    |                      ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 59 -     pub body: Rc<Box<Node>>,
[INFO] [stdout] 59 +     pub body: Rc<Box<dyn Node>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/object/mod.rs:60:32
[INFO] [stdout]    |
[INFO] [stdout] 60 |     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stdout]    |                                ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 60 -     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stdout] 60 +     pub parameters: Rc<Vec<Box<dyn Node>>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/parser/mod.rs:41:29
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub statements: Vec<Box<Node>>,
[INFO] [stdout]    |                             ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 41 -     pub statements: Vec<Box<Node>>,
[INFO] [stdout] 41 +     pub statements: Vec<Box<dyn Node>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast/mod.rs:55:56
[INFO] [stdout]    |
[INFO] [stdout] 55 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object>;
[INFO] [stdout]    |                                                        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 55 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object>;
[INFO] [stdout] 55 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:144:56
[INFO] [stdout]     |
[INFO] [stdout] 144 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 144 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 144 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:173:56
[INFO] [stdout]     |
[INFO] [stdout] 173 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 173 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 173 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:187:56
[INFO] [stdout]     |
[INFO] [stdout] 187 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 187 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 187 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:203:56
[INFO] [stdout]     |
[INFO] [stdout] 203 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 203 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 203 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:231:57
[INFO] [stdout]     |
[INFO] [stdout] 231 |     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                         ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 231 -     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 231 +     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:245:57
[INFO] [stdout]     |
[INFO] [stdout] 245 |     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                         ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 245 -     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 245 +     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:259:56
[INFO] [stdout]     |
[INFO] [stdout] 259 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 259 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 259 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:319:61
[INFO] [stdout]     |
[INFO] [stdout] 319 |     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 319 -     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 319 +     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:319:46
[INFO] [stdout]     |
[INFO] [stdout] 319 |     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                              ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 319 -     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 319 +     fn eval_minus_operator(&self, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:333:60
[INFO] [stdout]     |
[INFO] [stdout] 333 |     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                            ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 333 -     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 333 +     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:333:45
[INFO] [stdout]     |
[INFO] [stdout] 333 |     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 333 -     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 333 +     fn eval_bang_operator(&self, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:353:56
[INFO] [stdout]     |
[INFO] [stdout] 353 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 353 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 353 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:380:90
[INFO] [stdout]     |
[INFO] [stdout] 380 |     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                                                          ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 380 -     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 380 +     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:380:55
[INFO] [stdout]     |
[INFO] [stdout] 380 |     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                       ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 380 -     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 380 +     fn eval_boolean_infix_expression(&self, left: &Rc<dyn Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:380:75
[INFO] [stdout]     |
[INFO] [stdout] 380 |     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                                           ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 380 -     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 380 +     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:397:90
[INFO] [stdout]     |
[INFO] [stdout] 397 |     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                                                          ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 397 -     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 397 +     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:397:55
[INFO] [stdout]     |
[INFO] [stdout] 397 |     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                       ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 397 -     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 397 +     fn eval_integer_infix_expression(&self, left: &Rc<dyn Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:397:75
[INFO] [stdout]     |
[INFO] [stdout] 397 |     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                                           ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 397 -     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 397 +     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:443:56
[INFO] [stdout]     |
[INFO] [stdout] 443 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 443 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 443 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:482:56
[INFO] [stdout]     |
[INFO] [stdout] 482 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 482 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 482 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:534:56
[INFO] [stdout]     |
[INFO] [stdout] 534 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 534 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 534 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:562:70
[INFO] [stdout]     |
[INFO] [stdout] 562 |     fn eval_arguments(&self, env: Rc<RefCell<Enviroment>>) -> Vec<Rc<Object>> {
[INFO] [stdout]     |                                                                      ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 562 -     fn eval_arguments(&self, env: Rc<RefCell<Enviroment>>) -> Vec<Rc<Object>> {
[INFO] [stdout] 562 +     fn eval_arguments(&self, env: Rc<RefCell<Enviroment>>) -> Vec<Rc<dyn Object>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:583:13
[INFO] [stdout]     |
[INFO] [stdout] 583 |     ) -> Rc<Object> {
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 583 -     ) -> Rc<Object> {
[INFO] [stdout] 583 +     ) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:580:18
[INFO] [stdout]     |
[INFO] [stdout] 580 |         func: Rc<Object>,
[INFO] [stdout]     |                  ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 580 -         func: Rc<Object>,
[INFO] [stdout] 580 +         func: Rc<dyn Object>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:581:22
[INFO] [stdout]     |
[INFO] [stdout] 581 |         args: Vec<Rc<Object>>,
[INFO] [stdout]     |                      ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 581 -         args: Vec<Rc<Object>>,
[INFO] [stdout] 581 +         args: Vec<Rc<dyn Object>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:626:56
[INFO] [stdout]     |
[INFO] [stdout] 626 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 626 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 626 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/enviroment/mod.rs:40:53
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn insert(&mut self, key: String, value: Rc<Object>) {
[INFO] [stdout]    |                                                     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 40 -     pub fn insert(&mut self, key: String, value: Rc<Object>) {
[INFO] [stdout] 40 +     pub fn insert(&mut self, key: String, value: Rc<dyn Object>) {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/enviroment/mod.rs:45:50
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn get(&self, key: &String) -> Option<Rc<Object>> {
[INFO] [stdout]    |                                                  ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 45 -     pub fn get(&self, key: &String) -> Option<Rc<Object>> {
[INFO] [stdout] 45 +     pub fn get(&self, key: &String) -> Option<Rc<dyn Object>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:166:49
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn parse_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                 ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 166 -     fn parse_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 166 +     fn parse_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:174:53
[INFO] [stdout]     |
[INFO] [stdout] 174 |     fn parse_let_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 174 -     fn parse_let_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 174 +     fn parse_let_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:212:56
[INFO] [stdout]     |
[INFO] [stdout] 212 |     fn parse_return_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                        ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 212 -     fn parse_return_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 212 +     fn parse_return_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:234:60
[INFO] [stdout]     |
[INFO] [stdout] 234 |     fn parse_expression_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                            ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 234 -     fn parse_expression_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 234 +     fn parse_expression_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:255:55
[INFO] [stdout]     |
[INFO] [stdout] 255 |     fn parse_block_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                       ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 255 -     fn parse_block_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 255 +     fn parse_block_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:279:74
[INFO] [stdout]     |
[INFO] [stdout] 279 |     fn parse_expression(&mut self, precedence: Precedence) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                                          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 279 -     fn parse_expression(&mut self, precedence: Precedence) -> Option<Box<Node>> {
[INFO] [stdout] 279 +     fn parse_expression(&mut self, precedence: Precedence) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:317:61
[INFO] [stdout]     |
[INFO] [stdout] 317 |     fn parse_identifier_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                             ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 317 -     fn parse_identifier_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 317 +     fn parse_identifier_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:324:55
[INFO] [stdout]     |
[INFO] [stdout] 324 |     fn parse_bool_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                       ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 324 -     fn parse_bool_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 324 +     fn parse_bool_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:332:59
[INFO] [stdout]     |
[INFO] [stdout] 332 |     fn parse_integral_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                           ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 332 -     fn parse_integral_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 332 +     fn parse_integral_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:347:57
[INFO] [stdout]     |
[INFO] [stdout] 347 |     fn parse_prefix_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 347 -     fn parse_prefix_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 347 +     fn parse_prefix_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:366:73
[INFO] [stdout]     |
[INFO] [stdout] 366 |     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                                         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 366 -     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout] 366 +     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:366:52
[INFO] [stdout]     |
[INFO] [stdout] 366 |     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                    ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 366 -     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout] 366 +     fn parse_infix_expression(&mut self, left: Box<dyn Node>) -> Option<Box<Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:387:58
[INFO] [stdout]     |
[INFO] [stdout] 387 |     fn parse_grouped_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 387 -     fn parse_grouped_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 387 +     fn parse_grouped_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:399:57
[INFO] [stdout]     |
[INFO] [stdout] 399 |     fn parse_ifelse_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 399 -     fn parse_ifelse_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 399 +     fn parse_ifelse_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:451:55
[INFO] [stdout]     |
[INFO] [stdout] 451 |     fn parse_func_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                       ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 451 -     fn parse_func_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 451 +     fn parse_func_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:492:72
[INFO] [stdout]     |
[INFO] [stdout] 492 |     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                                        ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 492 -     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout] 492 +     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:492:51
[INFO] [stdout]     |
[INFO] [stdout] 492 |     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                   ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 492 -     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout] 492 +     fn parse_call_expression(&mut self, func: Box<dyn Node>) -> Option<Box<Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:204:28
[INFO] [stdout]     |
[INFO] [stdout] 204 |         let mut result: Rc<Object> = Rc::new(object::Null {});
[INFO] [stdout]     |                            ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 204 -         let mut result: Rc<Object> = Rc::new(object::Null {});
[INFO] [stdout] 204 +         let mut result: Rc<dyn Object> = Rc::new(object::Null {});
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:563:35
[INFO] [stdout]     |
[INFO] [stdout] 563 |         let mut to_return: Vec<Rc<Object>> = Vec::new();
[INFO] [stdout]     |                                   ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 563 -         let mut to_return: Vec<Rc<Object>> = Vec::new();
[INFO] [stdout] 563 +         let mut to_return: Vec<Rc<dyn Object>> = Vec::new();
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:564:28
[INFO] [stdout]     |
[INFO] [stdout] 564 |         let mut result: Rc<Object>;
[INFO] [stdout]     |                            ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 564 -         let mut result: Rc<Object>;
[INFO] [stdout] 564 +         let mut result: Rc<dyn Object>;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/parser/mod.rs:75:39
[INFO] [stdout]    |
[INFO] [stdout] 75 |         let mut statement: Option<Box<Node>>;
[INFO] [stdout]    |                                       ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 75 -         let mut statement: Option<Box<Node>>;
[INFO] [stdout] 75 +         let mut statement: Option<Box<dyn Node>>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:432:41
[INFO] [stdout]     |
[INFO] [stdout] 432 |         let mut alternative: Option<Box<Node>> = None;
[INFO] [stdout]     |                                         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 432 -         let mut alternative: Option<Box<Node>> = None;
[INFO] [stdout] 432 +         let mut alternative: Option<Box<dyn Node>> = None;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:460:37
[INFO] [stdout]     |
[INFO] [stdout] 460 |         let mut parameters: Vec<Box<Node>> = Vec::new();
[INFO] [stdout]     |                                     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 460 -         let mut parameters: Vec<Box<Node>> = Vec::new();
[INFO] [stdout] 460 +         let mut parameters: Vec<Box<dyn Node>> = Vec::new();
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:36:24
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let mut result: Rc<object::Object>;
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 36 -     let mut result: Rc<object::Object>;
[INFO] [stdout] 36 +     let mut result: Rc<dyn object::Object>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 71 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.74s
[INFO] running `Command { std: "docker" "inspect" "9d63aab5945af315c9cead150aef03d8cbdc9281634c8c624ae95ed414a84f85", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d63aab5945af315c9cead150aef03d8cbdc9281634c8c624ae95ed414a84f85", kill_on_drop: false }`
[INFO] [stdout] 9d63aab5945af315c9cead150aef03d8cbdc9281634c8c624ae95ed414a84f85
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 96daf9394cdc7dc9119bc4284b1f25b4812005352d1d6306195193a499c3e938
[INFO] running `Command { std: "docker" "start" "-a" "96daf9394cdc7dc9119bc4284b1f25b4812005352d1d6306195193a499c3e938", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-monkey v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast/mod.rs:68:20
[INFO] [stdout]    |
[INFO] [stdout] 68 |     pub value: Box<Node>,
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 68 -     pub value: Box<Node>,
[INFO] [stdout] 68 +     pub value: Box<dyn Node>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast/mod.rs:74:20
[INFO] [stdout]    |
[INFO] [stdout] 74 |     pub value: Box<Node>,
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 74 -     pub value: Box<Node>,
[INFO] [stdout] 74 +     pub value: Box<dyn Node>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast/mod.rs:79:20
[INFO] [stdout]    |
[INFO] [stdout] 79 |     pub value: Box<Node>,
[INFO] [stdout]    |                    ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 79 -     pub value: Box<Node>,
[INFO] [stdout] 79 +     pub value: Box<dyn Node>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast/mod.rs:84:29
[INFO] [stdout]    |
[INFO] [stdout] 84 |     pub statements: Vec<Box<Node>>,
[INFO] [stdout]    |                             ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 84 -     pub statements: Vec<Box<Node>>,
[INFO] [stdout] 84 +     pub statements: Vec<Box<dyn Node>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:105:20
[INFO] [stdout]     |
[INFO] [stdout] 105 |     pub right: Box<Node>,
[INFO] [stdout]     |                    ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 105 -     pub right: Box<Node>,
[INFO] [stdout] 105 +     pub right: Box<dyn Node>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:110:19
[INFO] [stdout]     |
[INFO] [stdout] 110 |     pub left: Box<Node>,
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 110 -     pub left: Box<Node>,
[INFO] [stdout] 110 +     pub left: Box<dyn Node>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:111:20
[INFO] [stdout]     |
[INFO] [stdout] 111 |     pub right: Box<Node>,
[INFO] [stdout]     |                    ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 111 -     pub right: Box<Node>,
[INFO] [stdout] 111 +     pub right: Box<dyn Node>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:116:24
[INFO] [stdout]     |
[INFO] [stdout] 116 |     pub condition: Box<Node>,
[INFO] [stdout]     |                        ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 116 -     pub condition: Box<Node>,
[INFO] [stdout] 116 +     pub condition: Box<dyn Node>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:117:26
[INFO] [stdout]     |
[INFO] [stdout] 117 |     pub consequence: Box<Node>,
[INFO] [stdout]     |                          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 117 -     pub consequence: Box<Node>,
[INFO] [stdout] 117 +     pub consequence: Box<dyn Node>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:118:33
[INFO] [stdout]     |
[INFO] [stdout] 118 |     pub alternative: Option<Box<Node>>,
[INFO] [stdout]     |                                 ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 118 -     pub alternative: Option<Box<Node>>,
[INFO] [stdout] 118 +     pub alternative: Option<Box<dyn Node>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:123:32
[INFO] [stdout]     |
[INFO] [stdout] 123 |     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stdout]     |                                ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 123 -     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stdout] 123 +     pub parameters: Rc<Vec<Box<dyn Node>>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:124:22
[INFO] [stdout]     |
[INFO] [stdout] 124 |     pub body: Rc<Box<Node>>,
[INFO] [stdout]     |                      ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 124 -     pub body: Rc<Box<Node>>,
[INFO] [stdout] 124 +     pub body: Rc<Box<dyn Node>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:129:28
[INFO] [stdout]     |
[INFO] [stdout] 129 |     pub arguments: Vec<Box<Node>>,
[INFO] [stdout]     |                            ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 129 -     pub arguments: Vec<Box<Node>>,
[INFO] [stdout] 129 +     pub arguments: Vec<Box<dyn Node>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:130:30
[INFO] [stdout]     |
[INFO] [stdout] 130 |     pub func_identifier: Box<Node>, // ast::IdentifierExpression
[INFO] [stdout]     |                              ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 130 -     pub func_identifier: Box<Node>, // ast::IdentifierExpression
[INFO] [stdout] 130 +     pub func_identifier: Box<dyn Node>, // ast::IdentifierExpression
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/enviroment/mod.rs:23:39
[INFO] [stdout]    |
[INFO] [stdout] 23 |     pub variables: HashMap<String, Rc<Object>>,
[INFO] [stdout]    |                                       ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 23 -     pub variables: HashMap<String, Rc<Object>>,
[INFO] [stdout] 23 +     pub variables: HashMap<String, Rc<dyn Object>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/object/mod.rs:59:22
[INFO] [stdout]    |
[INFO] [stdout] 59 |     pub body: Rc<Box<Node>>,
[INFO] [stdout]    |                      ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 59 -     pub body: Rc<Box<Node>>,
[INFO] [stdout] 59 +     pub body: Rc<Box<dyn Node>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/object/mod.rs:60:32
[INFO] [stdout]    |
[INFO] [stdout] 60 |     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stdout]    |                                ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 60 -     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stdout] 60 +     pub parameters: Rc<Vec<Box<dyn Node>>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/parser/mod.rs:41:29
[INFO] [stdout]    |
[INFO] [stdout] 41 |     pub statements: Vec<Box<Node>>,
[INFO] [stdout]    |                             ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 41 -     pub statements: Vec<Box<Node>>,
[INFO] [stdout] 41 +     pub statements: Vec<Box<dyn Node>>,
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/ast/mod.rs:55:56
[INFO] [stdout]    |
[INFO] [stdout] 55 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object>;
[INFO] [stdout]    |                                                        ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 55 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object>;
[INFO] [stdout] 55 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:144:56
[INFO] [stdout]     |
[INFO] [stdout] 144 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 144 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 144 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:173:56
[INFO] [stdout]     |
[INFO] [stdout] 173 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 173 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 173 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:187:56
[INFO] [stdout]     |
[INFO] [stdout] 187 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 187 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 187 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:203:56
[INFO] [stdout]     |
[INFO] [stdout] 203 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 203 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 203 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:231:57
[INFO] [stdout]     |
[INFO] [stdout] 231 |     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                         ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 231 -     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 231 +     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:245:57
[INFO] [stdout]     |
[INFO] [stdout] 245 |     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                         ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 245 -     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 245 +     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:259:56
[INFO] [stdout]     |
[INFO] [stdout] 259 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 259 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 259 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:319:61
[INFO] [stdout]     |
[INFO] [stdout] 319 |     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 319 -     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 319 +     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:319:46
[INFO] [stdout]     |
[INFO] [stdout] 319 |     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                              ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 319 -     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 319 +     fn eval_minus_operator(&self, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:333:60
[INFO] [stdout]     |
[INFO] [stdout] 333 |     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                            ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 333 -     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 333 +     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:333:45
[INFO] [stdout]     |
[INFO] [stdout] 333 |     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 333 -     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 333 +     fn eval_bang_operator(&self, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:353:56
[INFO] [stdout]     |
[INFO] [stdout] 353 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 353 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 353 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:380:90
[INFO] [stdout]     |
[INFO] [stdout] 380 |     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                                                          ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 380 -     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 380 +     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:380:55
[INFO] [stdout]     |
[INFO] [stdout] 380 |     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                       ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 380 -     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 380 +     fn eval_boolean_infix_expression(&self, left: &Rc<dyn Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:380:75
[INFO] [stdout]     |
[INFO] [stdout] 380 |     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                                           ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 380 -     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 380 +     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:397:90
[INFO] [stdout]     |
[INFO] [stdout] 397 |     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                                                          ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 397 -     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 397 +     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:397:55
[INFO] [stdout]     |
[INFO] [stdout] 397 |     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                       ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 397 -     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 397 +     fn eval_integer_infix_expression(&self, left: &Rc<dyn Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:397:75
[INFO] [stdout]     |
[INFO] [stdout] 397 |     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout]     |                                                                           ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 397 -     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stdout] 397 +     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:443:56
[INFO] [stdout]     |
[INFO] [stdout] 443 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 443 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 443 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:482:56
[INFO] [stdout]     |
[INFO] [stdout] 482 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 482 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 482 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:534:56
[INFO] [stdout]     |
[INFO] [stdout] 534 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 534 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 534 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:562:70
[INFO] [stdout]     |
[INFO] [stdout] 562 |     fn eval_arguments(&self, env: Rc<RefCell<Enviroment>>) -> Vec<Rc<Object>> {
[INFO] [stdout]     |                                                                      ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 562 -     fn eval_arguments(&self, env: Rc<RefCell<Enviroment>>) -> Vec<Rc<Object>> {
[INFO] [stdout] 562 +     fn eval_arguments(&self, env: Rc<RefCell<Enviroment>>) -> Vec<Rc<dyn Object>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:583:13
[INFO] [stdout]     |
[INFO] [stdout] 583 |     ) -> Rc<Object> {
[INFO] [stdout]     |             ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 583 -     ) -> Rc<Object> {
[INFO] [stdout] 583 +     ) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:580:18
[INFO] [stdout]     |
[INFO] [stdout] 580 |         func: Rc<Object>,
[INFO] [stdout]     |                  ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 580 -         func: Rc<Object>,
[INFO] [stdout] 580 +         func: Rc<dyn Object>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:581:22
[INFO] [stdout]     |
[INFO] [stdout] 581 |         args: Vec<Rc<Object>>,
[INFO] [stdout]     |                      ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 581 -         args: Vec<Rc<Object>>,
[INFO] [stdout] 581 +         args: Vec<Rc<dyn Object>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:626:56
[INFO] [stdout]     |
[INFO] [stdout] 626 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout]     |                                                        ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 626 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stdout] 626 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/enviroment/mod.rs:40:53
[INFO] [stdout]    |
[INFO] [stdout] 40 |     pub fn insert(&mut self, key: String, value: Rc<Object>) {
[INFO] [stdout]    |                                                     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 40 -     pub fn insert(&mut self, key: String, value: Rc<Object>) {
[INFO] [stdout] 40 +     pub fn insert(&mut self, key: String, value: Rc<dyn Object>) {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/enviroment/mod.rs:45:50
[INFO] [stdout]    |
[INFO] [stdout] 45 |     pub fn get(&self, key: &String) -> Option<Rc<Object>> {
[INFO] [stdout]    |                                                  ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 45 -     pub fn get(&self, key: &String) -> Option<Rc<Object>> {
[INFO] [stdout] 45 +     pub fn get(&self, key: &String) -> Option<Rc<dyn Object>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:166:49
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn parse_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                 ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 166 -     fn parse_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 166 +     fn parse_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:174:53
[INFO] [stdout]     |
[INFO] [stdout] 174 |     fn parse_let_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 174 -     fn parse_let_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 174 +     fn parse_let_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:212:56
[INFO] [stdout]     |
[INFO] [stdout] 212 |     fn parse_return_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                        ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 212 -     fn parse_return_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 212 +     fn parse_return_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:234:60
[INFO] [stdout]     |
[INFO] [stdout] 234 |     fn parse_expression_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                            ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 234 -     fn parse_expression_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 234 +     fn parse_expression_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:255:55
[INFO] [stdout]     |
[INFO] [stdout] 255 |     fn parse_block_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                       ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 255 -     fn parse_block_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 255 +     fn parse_block_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:279:74
[INFO] [stdout]     |
[INFO] [stdout] 279 |     fn parse_expression(&mut self, precedence: Precedence) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                                          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 279 -     fn parse_expression(&mut self, precedence: Precedence) -> Option<Box<Node>> {
[INFO] [stdout] 279 +     fn parse_expression(&mut self, precedence: Precedence) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:317:61
[INFO] [stdout]     |
[INFO] [stdout] 317 |     fn parse_identifier_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                             ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 317 -     fn parse_identifier_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 317 +     fn parse_identifier_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:324:55
[INFO] [stdout]     |
[INFO] [stdout] 324 |     fn parse_bool_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                       ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 324 -     fn parse_bool_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 324 +     fn parse_bool_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:332:59
[INFO] [stdout]     |
[INFO] [stdout] 332 |     fn parse_integral_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                           ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 332 -     fn parse_integral_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 332 +     fn parse_integral_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:347:57
[INFO] [stdout]     |
[INFO] [stdout] 347 |     fn parse_prefix_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 347 -     fn parse_prefix_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 347 +     fn parse_prefix_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:366:73
[INFO] [stdout]     |
[INFO] [stdout] 366 |     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                                         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 366 -     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout] 366 +     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:366:52
[INFO] [stdout]     |
[INFO] [stdout] 366 |     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                    ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 366 -     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout] 366 +     fn parse_infix_expression(&mut self, left: Box<dyn Node>) -> Option<Box<Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:387:58
[INFO] [stdout]     |
[INFO] [stdout] 387 |     fn parse_grouped_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                          ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 387 -     fn parse_grouped_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 387 +     fn parse_grouped_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:399:57
[INFO] [stdout]     |
[INFO] [stdout] 399 |     fn parse_ifelse_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 399 -     fn parse_ifelse_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 399 +     fn parse_ifelse_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:451:55
[INFO] [stdout]     |
[INFO] [stdout] 451 |     fn parse_func_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                       ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 451 -     fn parse_func_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stdout] 451 +     fn parse_func_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:492:72
[INFO] [stdout]     |
[INFO] [stdout] 492 |     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                                        ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 492 -     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout] 492 +     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<dyn Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:492:51
[INFO] [stdout]     |
[INFO] [stdout] 492 |     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout]     |                                                   ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 492 -     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stdout] 492 +     fn parse_call_expression(&mut self, func: Box<dyn Node>) -> Option<Box<Node>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:204:28
[INFO] [stdout]     |
[INFO] [stdout] 204 |         let mut result: Rc<Object> = Rc::new(object::Null {});
[INFO] [stdout]     |                            ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 204 -         let mut result: Rc<Object> = Rc::new(object::Null {});
[INFO] [stdout] 204 +         let mut result: Rc<dyn Object> = Rc::new(object::Null {});
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:563:35
[INFO] [stdout]     |
[INFO] [stdout] 563 |         let mut to_return: Vec<Rc<Object>> = Vec::new();
[INFO] [stdout]     |                                   ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 563 -         let mut to_return: Vec<Rc<Object>> = Vec::new();
[INFO] [stdout] 563 +         let mut to_return: Vec<Rc<dyn Object>> = Vec::new();
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ast/mod.rs:564:28
[INFO] [stdout]     |
[INFO] [stdout] 564 |         let mut result: Rc<Object>;
[INFO] [stdout]     |                            ^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 564 -         let mut result: Rc<Object>;
[INFO] [stdout] 564 +         let mut result: Rc<dyn Object>;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/parser/mod.rs:75:39
[INFO] [stdout]    |
[INFO] [stdout] 75 |         let mut statement: Option<Box<Node>>;
[INFO] [stdout]    |                                       ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 75 -         let mut statement: Option<Box<Node>>;
[INFO] [stdout] 75 +         let mut statement: Option<Box<dyn Node>>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:432:41
[INFO] [stdout]     |
[INFO] [stdout] 432 |         let mut alternative: Option<Box<Node>> = None;
[INFO] [stdout]     |                                         ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 432 -         let mut alternative: Option<Box<Node>> = None;
[INFO] [stdout] 432 +         let mut alternative: Option<Box<dyn Node>> = None;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/parser/mod.rs:460:37
[INFO] [stdout]     |
[INFO] [stdout] 460 |         let mut parameters: Vec<Box<Node>> = Vec::new();
[INFO] [stdout]     |                                     ^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 460 -         let mut parameters: Vec<Box<Node>> = Vec::new();
[INFO] [stdout] 460 +         let mut parameters: Vec<Box<dyn Node>> = Vec::new();
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/main.rs:36:24
[INFO] [stdout]    |
[INFO] [stdout] 36 |     let mut result: Rc<object::Object>;
[INFO] [stdout]    |                        ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: use `dyn`
[INFO] [stdout]    |
[INFO] [stdout] 36 -     let mut result: Rc<object::Object>;
[INFO] [stdout] 36 +     let mut result: Rc<dyn object::Object>;
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 71 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.81s
[INFO] running `Command { std: "docker" "inspect" "96daf9394cdc7dc9119bc4284b1f25b4812005352d1d6306195193a499c3e938", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "96daf9394cdc7dc9119bc4284b1f25b4812005352d1d6306195193a499c3e938", kill_on_drop: false }`
[INFO] [stdout] 96daf9394cdc7dc9119bc4284b1f25b4812005352d1d6306195193a499c3e938
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-37/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+1.60.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 2caafec3e79465cd8e2d544a961a29ca6b5a1fede2ec47f1c57e003707e635a6
[INFO] running `Command { std: "docker" "start" "-a" "2caafec3e79465cd8e2d544a961a29ca6b5a1fede2ec47f1c57e003707e635a6", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ast/mod.rs:68:20
[INFO] [stderr]    |
[INFO] [stderr] 68 |     pub value: Box<Node>,
[INFO] [stderr]    |                    ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 68 -     pub value: Box<Node>,
[INFO] [stderr] 68 +     pub value: Box<dyn Node>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ast/mod.rs:74:20
[INFO] [stderr]    |
[INFO] [stderr] 74 |     pub value: Box<Node>,
[INFO] [stderr]    |                    ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 74 -     pub value: Box<Node>,
[INFO] [stderr] 74 +     pub value: Box<dyn Node>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ast/mod.rs:79:20
[INFO] [stderr]    |
[INFO] [stderr] 79 |     pub value: Box<Node>,
[INFO] [stderr]    |                    ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 79 -     pub value: Box<Node>,
[INFO] [stderr] 79 +     pub value: Box<dyn Node>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ast/mod.rs:84:29
[INFO] [stderr]    |
[INFO] [stderr] 84 |     pub statements: Vec<Box<Node>>,
[INFO] [stderr]    |                             ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 84 -     pub statements: Vec<Box<Node>>,
[INFO] [stderr] 84 +     pub statements: Vec<Box<dyn Node>>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:105:20
[INFO] [stderr]     |
[INFO] [stderr] 105 |     pub right: Box<Node>,
[INFO] [stderr]     |                    ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 105 -     pub right: Box<Node>,
[INFO] [stderr] 105 +     pub right: Box<dyn Node>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:110:19
[INFO] [stderr]     |
[INFO] [stderr] 110 |     pub left: Box<Node>,
[INFO] [stderr]     |                   ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 110 -     pub left: Box<Node>,
[INFO] [stderr] 110 +     pub left: Box<dyn Node>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:111:20
[INFO] [stderr]     |
[INFO] [stderr] 111 |     pub right: Box<Node>,
[INFO] [stderr]     |                    ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 111 -     pub right: Box<Node>,
[INFO] [stderr] 111 +     pub right: Box<dyn Node>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:116:24
[INFO] [stderr]     |
[INFO] [stderr] 116 |     pub condition: Box<Node>,
[INFO] [stderr]     |                        ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 116 -     pub condition: Box<Node>,
[INFO] [stderr] 116 +     pub condition: Box<dyn Node>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:117:26
[INFO] [stderr]     |
[INFO] [stderr] 117 |     pub consequence: Box<Node>,
[INFO] [stderr]     |                          ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 117 -     pub consequence: Box<Node>,
[INFO] [stderr] 117 +     pub consequence: Box<dyn Node>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:118:33
[INFO] [stderr]     |
[INFO] [stderr] 118 |     pub alternative: Option<Box<Node>>,
[INFO] [stderr]     |                                 ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 118 -     pub alternative: Option<Box<Node>>,
[INFO] [stderr] 118 +     pub alternative: Option<Box<dyn Node>>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:123:32
[INFO] [stderr]     |
[INFO] [stderr] 123 |     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stderr]     |                                ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 123 -     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stderr] 123 +     pub parameters: Rc<Vec<Box<dyn Node>>>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:124:22
[INFO] [stderr]     |
[INFO] [stderr] 124 |     pub body: Rc<Box<Node>>,
[INFO] [stderr]     |                      ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 124 -     pub body: Rc<Box<Node>>,
[INFO] [stderr] 124 +     pub body: Rc<Box<dyn Node>>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:129:28
[INFO] [stderr]     |
[INFO] [stderr] 129 |     pub arguments: Vec<Box<Node>>,
[INFO] [stderr]     |                            ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 129 -     pub arguments: Vec<Box<Node>>,
[INFO] [stderr] 129 +     pub arguments: Vec<Box<dyn Node>>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:130:30
[INFO] [stderr]     |
[INFO] [stderr] 130 |     pub func_identifier: Box<Node>, // ast::IdentifierExpression
[INFO] [stderr]     |                              ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 130 -     pub func_identifier: Box<Node>, // ast::IdentifierExpression
[INFO] [stderr] 130 +     pub func_identifier: Box<dyn Node>, // ast::IdentifierExpression
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/enviroment/mod.rs:23:39
[INFO] [stderr]    |
[INFO] [stderr] 23 |     pub variables: HashMap<String, Rc<Object>>,
[INFO] [stderr]    |                                       ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 23 -     pub variables: HashMap<String, Rc<Object>>,
[INFO] [stderr] 23 +     pub variables: HashMap<String, Rc<dyn Object>>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/object/mod.rs:59:22
[INFO] [stderr]    |
[INFO] [stderr] 59 |     pub body: Rc<Box<Node>>,
[INFO] [stderr]    |                      ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 59 -     pub body: Rc<Box<Node>>,
[INFO] [stderr] 59 +     pub body: Rc<Box<dyn Node>>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/object/mod.rs:60:32
[INFO] [stderr]    |
[INFO] [stderr] 60 |     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stderr]    |                                ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 60 -     pub parameters: Rc<Vec<Box<Node>>>,
[INFO] [stderr] 60 +     pub parameters: Rc<Vec<Box<dyn Node>>>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parser/mod.rs:41:29
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub statements: Vec<Box<Node>>,
[INFO] [stderr]    |                             ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 41 -     pub statements: Vec<Box<Node>>,
[INFO] [stderr] 41 +     pub statements: Vec<Box<dyn Node>>,
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/ast/mod.rs:55:56
[INFO] [stderr]    |
[INFO] [stderr] 55 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object>;
[INFO] [stderr]    |                                                        ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 55 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object>;
[INFO] [stderr] 55 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object>;
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:144:56
[INFO] [stderr]     |
[INFO] [stderr] 144 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                        ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 144 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 144 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:173:56
[INFO] [stderr]     |
[INFO] [stderr] 173 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                        ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 173 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 173 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:187:56
[INFO] [stderr]     |
[INFO] [stderr] 187 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                        ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 187 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 187 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:203:56
[INFO] [stderr]     |
[INFO] [stderr] 203 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                        ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 203 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 203 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:231:57
[INFO] [stderr]     |
[INFO] [stderr] 231 |     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                         ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 231 -     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 231 +     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:245:57
[INFO] [stderr]     |
[INFO] [stderr] 245 |     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                         ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 245 -     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 245 +     fn eval(&self, _env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:259:56
[INFO] [stderr]     |
[INFO] [stderr] 259 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                        ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 259 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 259 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:319:61
[INFO] [stderr]     |
[INFO] [stderr] 319 |     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     |                                                             ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 319 -     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr] 319 +     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:319:46
[INFO] [stderr]     |
[INFO] [stderr] 319 |     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     |                                              ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 319 -     fn eval_minus_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr] 319 +     fn eval_minus_operator(&self, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:333:60
[INFO] [stderr]     |
[INFO] [stderr] 333 |     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     |                                                            ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 333 -     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr] 333 +     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:333:45
[INFO] [stderr]     |
[INFO] [stderr] 333 |     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     |                                             ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 333 -     fn eval_bang_operator(&self, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr] 333 +     fn eval_bang_operator(&self, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:353:56
[INFO] [stderr]     |
[INFO] [stderr] 353 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                        ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 353 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 353 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:380:90
[INFO] [stderr]     |
[INFO] [stderr] 380 |     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     |                                                                                          ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 380 -     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr] 380 +     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:380:55
[INFO] [stderr]     |
[INFO] [stderr] 380 |     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     |                                                       ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 380 -     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr] 380 +     fn eval_boolean_infix_expression(&self, left: &Rc<dyn Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:380:75
[INFO] [stderr]     |
[INFO] [stderr] 380 |     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     |                                                                           ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 380 -     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr] 380 +     fn eval_boolean_infix_expression(&self, left: &Rc<Object>, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:397:90
[INFO] [stderr]     |
[INFO] [stderr] 397 |     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     |                                                                                          ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 397 -     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr] 397 +     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:397:55
[INFO] [stderr]     |
[INFO] [stderr] 397 |     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     |                                                       ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 397 -     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr] 397 +     fn eval_integer_infix_expression(&self, left: &Rc<dyn Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:397:75
[INFO] [stderr]     |
[INFO] [stderr] 397 |     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr]     |                                                                           ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 397 -     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<Object>) -> Rc<Object> {
[INFO] [stderr] 397 +     fn eval_integer_infix_expression(&self, left: &Rc<Object>, right: &Rc<dyn Object>) -> Rc<Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:443:56
[INFO] [stderr]     |
[INFO] [stderr] 443 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                        ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 443 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 443 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:482:56
[INFO] [stderr]     |
[INFO] [stderr] 482 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                        ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 482 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 482 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:534:56
[INFO] [stderr]     |
[INFO] [stderr] 534 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                        ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 534 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 534 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:562:70
[INFO] [stderr]     |
[INFO] [stderr] 562 |     fn eval_arguments(&self, env: Rc<RefCell<Enviroment>>) -> Vec<Rc<Object>> {
[INFO] [stderr]     |                                                                      ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 562 -     fn eval_arguments(&self, env: Rc<RefCell<Enviroment>>) -> Vec<Rc<Object>> {
[INFO] [stderr] 562 +     fn eval_arguments(&self, env: Rc<RefCell<Enviroment>>) -> Vec<Rc<dyn Object>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:583:13
[INFO] [stderr]     |
[INFO] [stderr] 583 |     ) -> Rc<Object> {
[INFO] [stderr]     |             ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 583 -     ) -> Rc<Object> {
[INFO] [stderr] 583 +     ) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:580:18
[INFO] [stderr]     |
[INFO] [stderr] 580 |         func: Rc<Object>,
[INFO] [stderr]     |                  ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 580 -         func: Rc<Object>,
[INFO] [stderr] 580 +         func: Rc<dyn Object>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:581:22
[INFO] [stderr]     |
[INFO] [stderr] 581 |         args: Vec<Rc<Object>>,
[INFO] [stderr]     |                      ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 581 -         args: Vec<Rc<Object>>,
[INFO] [stderr] 581 +         args: Vec<Rc<dyn Object>>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:626:56
[INFO] [stderr]     |
[INFO] [stderr] 626 |     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr]     |                                                        ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 626 -     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<Object> {
[INFO] [stderr] 626 +     fn eval(&self, env: Rc<RefCell<Enviroment>>) -> Rc<dyn Object> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/enviroment/mod.rs:40:53
[INFO] [stderr]    |
[INFO] [stderr] 40 |     pub fn insert(&mut self, key: String, value: Rc<Object>) {
[INFO] [stderr]    |                                                     ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 40 -     pub fn insert(&mut self, key: String, value: Rc<Object>) {
[INFO] [stderr] 40 +     pub fn insert(&mut self, key: String, value: Rc<dyn Object>) {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/enviroment/mod.rs:45:50
[INFO] [stderr]    |
[INFO] [stderr] 45 |     pub fn get(&self, key: &String) -> Option<Rc<Object>> {
[INFO] [stderr]    |                                                  ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 45 -     pub fn get(&self, key: &String) -> Option<Rc<Object>> {
[INFO] [stderr] 45 +     pub fn get(&self, key: &String) -> Option<Rc<dyn Object>> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:166:49
[INFO] [stderr]     |
[INFO] [stderr] 166 |     fn parse_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                 ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 166 -     fn parse_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 166 +     fn parse_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:174:53
[INFO] [stderr]     |
[INFO] [stderr] 174 |     fn parse_let_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                     ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 174 -     fn parse_let_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 174 +     fn parse_let_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:212:56
[INFO] [stderr]     |
[INFO] [stderr] 212 |     fn parse_return_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                        ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 212 -     fn parse_return_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 212 +     fn parse_return_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:234:60
[INFO] [stderr]     |
[INFO] [stderr] 234 |     fn parse_expression_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                            ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 234 -     fn parse_expression_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 234 +     fn parse_expression_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:255:55
[INFO] [stderr]     |
[INFO] [stderr] 255 |     fn parse_block_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                       ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 255 -     fn parse_block_statement(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 255 +     fn parse_block_statement(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:279:74
[INFO] [stderr]     |
[INFO] [stderr] 279 |     fn parse_expression(&mut self, precedence: Precedence) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                                          ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 279 -     fn parse_expression(&mut self, precedence: Precedence) -> Option<Box<Node>> {
[INFO] [stderr] 279 +     fn parse_expression(&mut self, precedence: Precedence) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:317:61
[INFO] [stderr]     |
[INFO] [stderr] 317 |     fn parse_identifier_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                             ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 317 -     fn parse_identifier_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 317 +     fn parse_identifier_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:324:55
[INFO] [stderr]     |
[INFO] [stderr] 324 |     fn parse_bool_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                       ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 324 -     fn parse_bool_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 324 +     fn parse_bool_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:332:59
[INFO] [stderr]     |
[INFO] [stderr] 332 |     fn parse_integral_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                           ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 332 -     fn parse_integral_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 332 +     fn parse_integral_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:347:57
[INFO] [stderr]     |
[INFO] [stderr] 347 |     fn parse_prefix_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 347 -     fn parse_prefix_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 347 +     fn parse_prefix_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:366:73
[INFO] [stderr]     |
[INFO] [stderr] 366 |     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                                         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 366 -     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stderr] 366 +     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:366:52
[INFO] [stderr]     |
[INFO] [stderr] 366 |     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                    ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 366 -     fn parse_infix_expression(&mut self, left: Box<Node>) -> Option<Box<Node>> {
[INFO] [stderr] 366 +     fn parse_infix_expression(&mut self, left: Box<dyn Node>) -> Option<Box<Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:387:58
[INFO] [stderr]     |
[INFO] [stderr] 387 |     fn parse_grouped_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                          ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 387 -     fn parse_grouped_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 387 +     fn parse_grouped_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:399:57
[INFO] [stderr]     |
[INFO] [stderr] 399 |     fn parse_ifelse_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 399 -     fn parse_ifelse_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 399 +     fn parse_ifelse_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:451:55
[INFO] [stderr]     |
[INFO] [stderr] 451 |     fn parse_func_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                       ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 451 -     fn parse_func_expression(&mut self) -> Option<Box<Node>> {
[INFO] [stderr] 451 +     fn parse_func_expression(&mut self) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:492:72
[INFO] [stderr]     |
[INFO] [stderr] 492 |     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                                        ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 492 -     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stderr] 492 +     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<dyn Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:492:51
[INFO] [stderr]     |
[INFO] [stderr] 492 |     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stderr]     |                                                   ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 492 -     fn parse_call_expression(&mut self, func: Box<Node>) -> Option<Box<Node>> {
[INFO] [stderr] 492 +     fn parse_call_expression(&mut self, func: Box<dyn Node>) -> Option<Box<Node>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:204:28
[INFO] [stderr]     |
[INFO] [stderr] 204 |         let mut result: Rc<Object> = Rc::new(object::Null {});
[INFO] [stderr]     |                            ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 204 -         let mut result: Rc<Object> = Rc::new(object::Null {});
[INFO] [stderr] 204 +         let mut result: Rc<dyn Object> = Rc::new(object::Null {});
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:563:35
[INFO] [stderr]     |
[INFO] [stderr] 563 |         let mut to_return: Vec<Rc<Object>> = Vec::new();
[INFO] [stderr]     |                                   ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 563 -         let mut to_return: Vec<Rc<Object>> = Vec::new();
[INFO] [stderr] 563 +         let mut to_return: Vec<Rc<dyn Object>> = Vec::new();
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/ast/mod.rs:564:28
[INFO] [stderr]     |
[INFO] [stderr] 564 |         let mut result: Rc<Object>;
[INFO] [stderr]     |                            ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 564 -         let mut result: Rc<Object>;
[INFO] [stderr] 564 +         let mut result: Rc<dyn Object>;
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parser/mod.rs:75:39
[INFO] [stderr]    |
[INFO] [stderr] 75 |         let mut statement: Option<Box<Node>>;
[INFO] [stderr]    |                                       ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 75 -         let mut statement: Option<Box<Node>>;
[INFO] [stderr] 75 +         let mut statement: Option<Box<dyn Node>>;
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:432:41
[INFO] [stderr]     |
[INFO] [stderr] 432 |         let mut alternative: Option<Box<Node>> = None;
[INFO] [stderr]     |                                         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 432 -         let mut alternative: Option<Box<Node>> = None;
[INFO] [stderr] 432 +         let mut alternative: Option<Box<dyn Node>> = None;
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/parser/mod.rs:460:37
[INFO] [stderr]     |
[INFO] [stderr] 460 |         let mut parameters: Vec<Box<Node>> = Vec::new();
[INFO] [stderr]     |                                     ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]     |
[INFO] [stderr] 460 -         let mut parameters: Vec<Box<Node>> = Vec::new();
[INFO] [stderr] 460 +         let mut parameters: Vec<Box<dyn Node>> = Vec::new();
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/main.rs:36:24
[INFO] [stderr]    |
[INFO] [stderr] 36 |     let mut result: Rc<object::Object>;
[INFO] [stderr]    |                        ^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2018) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stderr] help: use `dyn`
[INFO] [stderr]    |
[INFO] [stderr] 36 -     let mut result: Rc<object::Object>;
[INFO] [stderr] 36 +     let mut result: Rc<dyn object::Object>;
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-monkey` (bin "rust-monkey" test) generated 71 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.64s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/rust_monkey-53597d72b3e26c26)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "2caafec3e79465cd8e2d544a961a29ca6b5a1fede2ec47f1c57e003707e635a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2caafec3e79465cd8e2d544a961a29ca6b5a1fede2ec47f1c57e003707e635a6", kill_on_drop: false }`
[INFO] [stdout] 2caafec3e79465cd8e2d544a961a29ca6b5a1fede2ec47f1c57e003707e635a6