[INFO] cloning repository https://github.com/TrolledWoods/TrolledLang
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/TrolledWoods/TrolledLang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTrolledWoods%2FTrolledLang", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTrolledWoods%2FTrolledLang'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8a1f7b9dc88ef82eb69a91ad0a7d54b0a56bc7b2
[INFO] testing TrolledWoods/TrolledLang against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FTrolledWoods%2FTrolledLang" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/TrolledWoods/TrolledLang on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/TrolledWoods/TrolledLang
[INFO] finished tweaking git repo https://github.com/TrolledWoods/TrolledLang
[INFO] tweaked toml for git repo https://github.com/TrolledWoods/TrolledLang written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/TrolledWoods/TrolledLang already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9e9a2a42c0cce27711d7be6cf17d3b0600ebccfd38478965bcea08d34226ccdf
[INFO] running `Command { std: "docker" "start" "-a" "9e9a2a42c0cce27711d7be6cf17d3b0600ebccfd38478965bcea08d34226ccdf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e9a2a42c0cce27711d7be6cf17d3b0600ebccfd38478965bcea08d34226ccdf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e9a2a42c0cce27711d7be6cf17d3b0600ebccfd38478965bcea08d34226ccdf", kill_on_drop: false }`
[INFO] [stdout] 9e9a2a42c0cce27711d7be6cf17d3b0600ebccfd38478965bcea08d34226ccdf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 92f6a80f877e354da2e1f00f99a27db214277685f94710a5dab27d90ed1b7bb8
[INFO] running `Command { std: "docker" "start" "-a" "92f6a80f877e354da2e1f00f99a27db214277685f94710a5dab27d90ed1b7bb8", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling language v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/lexer/mod.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:107:20
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub cause: Box<ParserError>,
[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] 107 -     pub cause: Box<ParserError>,
[INFO] [stdout] 107 +     pub cause: Box<dyn ParserError>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:137:25
[INFO] [stdout]     |
[INFO] [stdout] 137 |     pub causes: Vec<Box<ParserError>>,
[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] 137 -     pub causes: Vec<Box<ParserError>>,
[INFO] [stdout] 137 +     pub causes: Vec<Box<dyn ParserError>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:138:29
[INFO] [stdout]     |
[INFO] [stdout] 138 |     pub recover: Option<Box<SyntaxTreeNode>>
[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] 138 -     pub recover: Option<Box<SyntaxTreeNode>>
[INFO] [stdout] 138 +     pub recover: Option<Box<dyn SyntaxTreeNode>>
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lexer/block_node.rs:6:27
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub contents: Vec<Box<SyntaxTreeNode>>,
[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] 6 -     pub contents: Vec<Box<SyntaxTreeNode>>,
[INFO] [stdout] 6 +     pub contents: Vec<Box<dyn SyntaxTreeNode>>,
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lexer/block_node.rs:7:29
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub _return: Option<Box<SyntaxTreeNode>>
[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] 7 -     pub _return: Option<Box<SyntaxTreeNode>>
[INFO] [stdout] 7 +     pub _return: Option<Box<dyn SyntaxTreeNode>>
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lexer/assignment_node.rs:6:19
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub data: Box<SyntaxTreeNode>
[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] 6 -     pub data: Box<SyntaxTreeNode>
[INFO] [stdout] 6 +     pub data: Box<dyn SyntaxTreeNode>
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lexer/mod.rs:97:28
[INFO] [stdout]    |
[INFO] [stdout] 97 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 97 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stdout] 97 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:166:41
[INFO] [stdout]     |
[INFO] [stdout] 166 | pub type ParseResult<T> = Result<T, Box<ParserError>>;
[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 - pub type ParseResult<T> = Result<T, Box<ParserError>>;
[INFO] [stdout] 166 + pub type ParseResult<T> = Result<T, Box<dyn ParserError>>;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/mod.rs:115:28
[INFO] [stdout]     |
[INFO] [stdout] 115 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 115 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stdout] 115 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/mod.rs:184:86
[INFO] [stdout]     |
[INFO] [stdout] 184 | fn parse_literal(tokens: &mut Needle<Token>, meta: &TextMetaData) -> ParseResult<Box<SyntaxTreeNode>> {
[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] 184 - fn parse_literal(tokens: &mut Needle<Token>, meta: &TextMetaData) -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stdout] 184 + fn parse_literal(tokens: &mut Needle<Token>, meta: &TextMetaData) -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/mod.rs:197:28
[INFO] [stdout]     |
[INFO] [stdout] 197 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 197 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stdout] 197 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/mod.rs:274:28
[INFO] [stdout]     |
[INFO] [stdout] 274 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 274 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stdout] 274 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lexer/errors.rs:6:35
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 6 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stdout] 6 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lexer/errors.rs:11:47
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn cmp_strength(&self, other: &Option<Box<ParserError>>) -> bool {
[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] 11 -     fn cmp_strength(&self, other: &Option<Box<ParserError>>) -> bool {
[INFO] [stdout] 11 +     fn cmp_strength(&self, other: &Option<Box<dyn ParserError>>) -> bool {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lexer/errors.rs:44:35
[INFO] [stdout]    |
[INFO] [stdout] 44 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 44 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stdout] 44 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:125:35
[INFO] [stdout]     |
[INFO] [stdout] 125 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 125 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stdout] 125 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:157:35
[INFO] [stdout]     |
[INFO] [stdout] 157 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 157 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stdout] 157 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/mod.rs:306:31
[INFO] [stdout]     |
[INFO] [stdout] 306 |     let mut contents: Vec<Box<SyntaxTreeNode>> = 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] 306 -     let mut contents: Vec<Box<SyntaxTreeNode>> = Vec::new();
[INFO] [stdout] 306 +     let mut contents: Vec<Box<dyn SyntaxTreeNode>> = Vec::new();
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/main.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     return;
[INFO] [stdout]    |     ------ any code following this expression is unreachable
[INFO] [stdout] 47 | 
[INFO] [stdout] 48 |     let args: Vec<String> = std::env::args().collect();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scope`
[INFO] [stdout]   --> src/lexer/mod.rs:27:36
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stdout]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_scope`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scopes`
[INFO] [stdout]   --> src/lexer/mod.rs:27:56
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stdout]    |                                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scopes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scope`
[INFO] [stdout]   --> src/lexer/block_node.rs:31:36
[INFO] [stdout]    |
[INFO] [stdout] 31 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stdout]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_scope`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scope`
[INFO] [stdout]   --> src/lexer/literal_node.rs:20:36
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stdout]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_scope`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scopes`
[INFO] [stdout]   --> src/lexer/literal_node.rs:20:56
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stdout]    |                                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scopes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tokenizer/mod.rs:377:9
[INFO] [stdout]     |
[INFO] [stdout] 377 |     let mut errors = Vec::new();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `VirtualMachine`
[INFO] [stdout]  --> src/vm/mod.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct VirtualMachine {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/vm/mod.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn new(instructions: &ByteVec) -> VirtualMachine {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `collapse`
[INFO] [stdout]   --> src/lexer/type_handler.rs:46:12
[INFO] [stdout]    |
[INFO] [stdout] 46 |     pub fn collapse(&self) -> Option<Type> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_member_loc`
[INFO] [stdout]    --> src/lexer/type_handler.rs:115:8
[INFO] [stdout]     |
[INFO] [stdout] 115 |     fn get_member_loc(&self, scope_id: u32, var_name: &str) -> Option<u32> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]   --> src/vm/byte_vec.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     pub fn iter(&self) -> ByteVecIterator {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push_byte_vec`
[INFO] [stdout]    --> src/vm/byte_vec.rs:133:12
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn push_byte_vec(&mut self, byte_vec: &ByteVec) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 32 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.17s
[INFO] running `Command { std: "docker" "inspect" "92f6a80f877e354da2e1f00f99a27db214277685f94710a5dab27d90ed1b7bb8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92f6a80f877e354da2e1f00f99a27db214277685f94710a5dab27d90ed1b7bb8", kill_on_drop: false }`
[INFO] [stdout] 92f6a80f877e354da2e1f00f99a27db214277685f94710a5dab27d90ed1b7bb8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+beta-2022-04-10" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e843ec4b5327b7ba0effc5a1b0ce2bc4cdf62295425ef44d0d3b89edd635b21
[INFO] running `Command { std: "docker" "start" "-a" "1e843ec4b5327b7ba0effc5a1b0ce2bc4cdf62295425ef44d0d3b89edd635b21", kill_on_drop: false }`
[INFO] [stderr]    Compiling language v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::collections::HashMap`
[INFO] [stdout]  --> src/lexer/mod.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use std::collections::HashMap;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:107:20
[INFO] [stdout]     |
[INFO] [stdout] 107 |     pub cause: Box<ParserError>,
[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] 107 -     pub cause: Box<ParserError>,
[INFO] [stdout] 107 +     pub cause: Box<dyn ParserError>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:137:25
[INFO] [stdout]     |
[INFO] [stdout] 137 |     pub causes: Vec<Box<ParserError>>,
[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] 137 -     pub causes: Vec<Box<ParserError>>,
[INFO] [stdout] 137 +     pub causes: Vec<Box<dyn ParserError>>,
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:138:29
[INFO] [stdout]     |
[INFO] [stdout] 138 |     pub recover: Option<Box<SyntaxTreeNode>>
[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] 138 -     pub recover: Option<Box<SyntaxTreeNode>>
[INFO] [stdout] 138 +     pub recover: Option<Box<dyn SyntaxTreeNode>>
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lexer/block_node.rs:6:27
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub contents: Vec<Box<SyntaxTreeNode>>,
[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] 6 -     pub contents: Vec<Box<SyntaxTreeNode>>,
[INFO] [stdout] 6 +     pub contents: Vec<Box<dyn SyntaxTreeNode>>,
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lexer/block_node.rs:7:29
[INFO] [stdout]   |
[INFO] [stdout] 7 |     pub _return: Option<Box<SyntaxTreeNode>>
[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] 7 -     pub _return: Option<Box<SyntaxTreeNode>>
[INFO] [stdout] 7 +     pub _return: Option<Box<dyn SyntaxTreeNode>>
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lexer/assignment_node.rs:6:19
[INFO] [stdout]   |
[INFO] [stdout] 6 |     pub data: Box<SyntaxTreeNode>
[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] 6 -     pub data: Box<SyntaxTreeNode>
[INFO] [stdout] 6 +     pub data: Box<dyn SyntaxTreeNode>
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lexer/mod.rs:97:28
[INFO] [stdout]    |
[INFO] [stdout] 97 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 97 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stdout] 97 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:166:41
[INFO] [stdout]     |
[INFO] [stdout] 166 | pub type ParseResult<T> = Result<T, Box<ParserError>>;
[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 - pub type ParseResult<T> = Result<T, Box<ParserError>>;
[INFO] [stdout] 166 + pub type ParseResult<T> = Result<T, Box<dyn ParserError>>;
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/mod.rs:115:28
[INFO] [stdout]     |
[INFO] [stdout] 115 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 115 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stdout] 115 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/mod.rs:184:86
[INFO] [stdout]     |
[INFO] [stdout] 184 | fn parse_literal(tokens: &mut Needle<Token>, meta: &TextMetaData) -> ParseResult<Box<SyntaxTreeNode>> {
[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] 184 - fn parse_literal(tokens: &mut Needle<Token>, meta: &TextMetaData) -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stdout] 184 + fn parse_literal(tokens: &mut Needle<Token>, meta: &TextMetaData) -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/mod.rs:197:28
[INFO] [stdout]     |
[INFO] [stdout] 197 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 197 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stdout] 197 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/mod.rs:274:28
[INFO] [stdout]     |
[INFO] [stdout] 274 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 274 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stdout] 274 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]  --> src/lexer/errors.rs:6:35
[INFO] [stdout]   |
[INFO] [stdout] 6 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 6 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stdout] 6 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stdout]   | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lexer/errors.rs:11:47
[INFO] [stdout]    |
[INFO] [stdout] 11 |     fn cmp_strength(&self, other: &Option<Box<ParserError>>) -> bool {
[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] 11 -     fn cmp_strength(&self, other: &Option<Box<ParserError>>) -> bool {
[INFO] [stdout] 11 +     fn cmp_strength(&self, other: &Option<Box<dyn ParserError>>) -> bool {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/lexer/errors.rs:44:35
[INFO] [stdout]    |
[INFO] [stdout] 44 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 44 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stdout] 44 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stdout]    | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:125:35
[INFO] [stdout]     |
[INFO] [stdout] 125 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 125 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stdout] 125 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/errors.rs:157:35
[INFO] [stdout]     |
[INFO] [stdout] 157 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 157 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stdout] 157 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/lexer/mod.rs:306:31
[INFO] [stdout]     |
[INFO] [stdout] 306 |     let mut contents: Vec<Box<SyntaxTreeNode>> = 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] 306 -     let mut contents: Vec<Box<SyntaxTreeNode>> = Vec::new();
[INFO] [stdout] 306 +     let mut contents: Vec<Box<dyn SyntaxTreeNode>> = Vec::new();
[INFO] [stdout]     | 
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable statement
[INFO] [stdout]   --> src/main.rs:48:5
[INFO] [stdout]    |
[INFO] [stdout] 46 |     return;
[INFO] [stdout]    |     ------ any code following this expression is unreachable
[INFO] [stdout] 47 | 
[INFO] [stdout] 48 |     let args: Vec<String> = std::env::args().collect();
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scope`
[INFO] [stdout]   --> src/lexer/mod.rs:27:36
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stdout]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_scope`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scopes`
[INFO] [stdout]   --> src/lexer/mod.rs:27:56
[INFO] [stdout]    |
[INFO] [stdout] 27 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stdout]    |                                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scopes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scope`
[INFO] [stdout]   --> src/lexer/block_node.rs:31:36
[INFO] [stdout]    |
[INFO] [stdout] 31 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stdout]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_scope`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scope`
[INFO] [stdout]   --> src/lexer/literal_node.rs:20:36
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stdout]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_scope`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `scopes`
[INFO] [stdout]   --> src/lexer/literal_node.rs:20:56
[INFO] [stdout]    |
[INFO] [stdout] 20 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stdout]    |                                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scopes`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/tokenizer/mod.rs:377:9
[INFO] [stdout]     |
[INFO] [stdout] 377 |     let mut errors = Vec::new();
[INFO] [stdout]     |         ----^^^^^^
[INFO] [stdout]     |         |
[INFO] [stdout]     |         help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `VirtualMachine`
[INFO] [stdout]  --> src/vm/mod.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | pub struct VirtualMachine {
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/vm/mod.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn new(instructions: &ByteVec) -> VirtualMachine {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `collapse`
[INFO] [stdout]   --> src/lexer/type_handler.rs:46:12
[INFO] [stdout]    |
[INFO] [stdout] 46 |     pub fn collapse(&self) -> Option<Type> {
[INFO] [stdout]    |            ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_member_loc`
[INFO] [stdout]    --> src/lexer/type_handler.rs:115:8
[INFO] [stdout]     |
[INFO] [stdout] 115 |     fn get_member_loc(&self, scope_id: u32, var_name: &str) -> Option<u32> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `iter`
[INFO] [stdout]   --> src/vm/byte_vec.rs:54:12
[INFO] [stdout]    |
[INFO] [stdout] 54 |     pub fn iter(&self) -> ByteVecIterator {
[INFO] [stdout]    |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `push_byte_vec`
[INFO] [stdout]    --> src/vm/byte_vec.rs:133:12
[INFO] [stdout]     |
[INFO] [stdout] 133 |     pub fn push_byte_vec(&mut self, byte_vec: &ByteVec) {
[INFO] [stdout]     |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 32 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.42s
[INFO] [stderr]   Executable unittests src/main.rs (/opt/rustwide/target/debug/deps/language-165bcd8b14a93e75)
[INFO] running `Command { std: "docker" "inspect" "1e843ec4b5327b7ba0effc5a1b0ce2bc4cdf62295425ef44d0d3b89edd635b21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e843ec4b5327b7ba0effc5a1b0ce2bc4cdf62295425ef44d0d3b89edd635b21", kill_on_drop: false }`
[INFO] [stdout] 1e843ec4b5327b7ba0effc5a1b0ce2bc4cdf62295425ef44d0d3b89edd635b21
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "+beta-2022-04-10" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 7962bd3c239a5bac1f7f831b1c6f6ea45dff281999e134be5f1ad5bc7f4f2cb2
[INFO] running `Command { std: "docker" "start" "-a" "7962bd3c239a5bac1f7f831b1c6f6ea45dff281999e134be5f1ad5bc7f4f2cb2", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr] warning: unused import: `std::collections::HashMap`
[INFO] [stderr]  --> src/lexer/mod.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use std::collections::HashMap;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/errors.rs:107:20
[INFO] [stderr]     |
[INFO] [stderr] 107 |     pub cause: Box<ParserError>,
[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] 107 -     pub cause: Box<ParserError>,
[INFO] [stderr] 107 +     pub cause: Box<dyn ParserError>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/errors.rs:137:25
[INFO] [stderr]     |
[INFO] [stderr] 137 |     pub causes: Vec<Box<ParserError>>,
[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] 137 -     pub causes: Vec<Box<ParserError>>,
[INFO] [stderr] 137 +     pub causes: Vec<Box<dyn ParserError>>,
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/errors.rs:138:29
[INFO] [stderr]     |
[INFO] [stderr] 138 |     pub recover: Option<Box<SyntaxTreeNode>>
[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] 138 -     pub recover: Option<Box<SyntaxTreeNode>>
[INFO] [stderr] 138 +     pub recover: Option<Box<dyn SyntaxTreeNode>>
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/lexer/block_node.rs:6:27
[INFO] [stderr]   |
[INFO] [stderr] 6 |     pub contents: Vec<Box<SyntaxTreeNode>>,
[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] 6 -     pub contents: Vec<Box<SyntaxTreeNode>>,
[INFO] [stderr] 6 +     pub contents: Vec<Box<dyn SyntaxTreeNode>>,
[INFO] [stderr]   | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/lexer/block_node.rs:7:29
[INFO] [stderr]   |
[INFO] [stderr] 7 |     pub _return: Option<Box<SyntaxTreeNode>>
[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] 7 -     pub _return: Option<Box<SyntaxTreeNode>>
[INFO] [stderr] 7 +     pub _return: Option<Box<dyn SyntaxTreeNode>>
[INFO] [stderr]   | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/lexer/assignment_node.rs:6:19
[INFO] [stderr]   |
[INFO] [stderr] 6 |     pub data: Box<SyntaxTreeNode>
[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] 6 -     pub data: Box<SyntaxTreeNode>
[INFO] [stderr] 6 +     pub data: Box<dyn SyntaxTreeNode>
[INFO] [stderr]   | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lexer/mod.rs:97:28
[INFO] [stderr]    |
[INFO] [stderr] 97 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 97 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stderr] 97 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/errors.rs:166:41
[INFO] [stderr]     |
[INFO] [stderr] 166 | pub type ParseResult<T> = Result<T, Box<ParserError>>;
[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 - pub type ParseResult<T> = Result<T, Box<ParserError>>;
[INFO] [stderr] 166 + pub type ParseResult<T> = Result<T, Box<dyn ParserError>>;
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/mod.rs:115:28
[INFO] [stderr]     |
[INFO] [stderr] 115 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 115 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stderr] 115 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/mod.rs:184:86
[INFO] [stderr]     |
[INFO] [stderr] 184 | fn parse_literal(tokens: &mut Needle<Token>, meta: &TextMetaData) -> ParseResult<Box<SyntaxTreeNode>> {
[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] 184 - fn parse_literal(tokens: &mut Needle<Token>, meta: &TextMetaData) -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stderr] 184 + fn parse_literal(tokens: &mut Needle<Token>, meta: &TextMetaData) -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/mod.rs:197:28
[INFO] [stderr]     |
[INFO] [stderr] 197 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 197 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stderr] 197 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/mod.rs:274:28
[INFO] [stderr]     |
[INFO] [stderr] 274 |         -> ParseResult<Box<SyntaxTreeNode>> {
[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] 274 -         -> ParseResult<Box<SyntaxTreeNode>> {
[INFO] [stderr] 274 +         -> ParseResult<Box<dyn SyntaxTreeNode>> {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/lexer/errors.rs:6:35
[INFO] [stderr]   |
[INFO] [stderr] 6 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 6 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stderr] 6 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stderr]   | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lexer/errors.rs:11:47
[INFO] [stderr]    |
[INFO] [stderr] 11 |     fn cmp_strength(&self, other: &Option<Box<ParserError>>) -> bool {
[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] 11 -     fn cmp_strength(&self, other: &Option<Box<ParserError>>) -> bool {
[INFO] [stderr] 11 +     fn cmp_strength(&self, other: &Option<Box<dyn ParserError>>) -> bool {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/lexer/errors.rs:44:35
[INFO] [stderr]    |
[INFO] [stderr] 44 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 44 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stderr] 44 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stderr]    | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/errors.rs:125:35
[INFO] [stderr]     |
[INFO] [stderr] 125 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 125 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stderr] 125 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/errors.rs:157:35
[INFO] [stderr]     |
[INFO] [stderr] 157 |     fn get_causes(&self) -> &[Box<ParserError>] {
[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] 157 -     fn get_causes(&self) -> &[Box<ParserError>] {
[INFO] [stderr] 157 +     fn get_causes(&self) -> &[Box<dyn ParserError>] {
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/lexer/mod.rs:306:31
[INFO] [stderr]     |
[INFO] [stderr] 306 |     let mut contents: Vec<Box<SyntaxTreeNode>> = 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] 306 -     let mut contents: Vec<Box<SyntaxTreeNode>> = Vec::new();
[INFO] [stderr] 306 +     let mut contents: Vec<Box<dyn SyntaxTreeNode>> = Vec::new();
[INFO] [stderr]     | 
[INFO] [stderr] 
[INFO] [stderr] warning: unreachable statement
[INFO] [stderr]   --> src/main.rs:48:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     return;
[INFO] [stderr]    |     ------ any code following this expression is unreachable
[INFO] [stderr] 47 | 
[INFO] [stderr] 48 |     let args: Vec<String> = std::env::args().collect();
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ unreachable statement
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unreachable_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scope`
[INFO] [stderr]   --> src/lexer/mod.rs:27:36
[INFO] [stderr]    |
[INFO] [stderr] 27 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stderr]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_scope`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scopes`
[INFO] [stderr]   --> src/lexer/mod.rs:27:56
[INFO] [stderr]    |
[INFO] [stderr] 27 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stderr]    |                                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scopes`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scope`
[INFO] [stderr]   --> src/lexer/block_node.rs:31:36
[INFO] [stderr]    |
[INFO] [stderr] 31 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stderr]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_scope`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scope`
[INFO] [stderr]   --> src/lexer/literal_node.rs:20:36
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stderr]    |                                    ^^^^^ help: if this is intentional, prefix it with an underscore: `_scope`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `scopes`
[INFO] [stderr]   --> src/lexer/literal_node.rs:20:56
[INFO] [stderr]    |
[INFO] [stderr] 20 |     fn get_possible_returns(&self, scope: ScopeHandle, scopes: &ScopePool) -> TypeCollection {
[INFO] [stderr]    |                                                        ^^^^^^ help: if this is intentional, prefix it with an underscore: `_scopes`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tokenizer/mod.rs:377:9
[INFO] [stderr]     |
[INFO] [stderr] 377 |     let mut errors = Vec::new();
[INFO] [stderr]     |         ----^^^^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `VirtualMachine`
[INFO] [stderr]  --> src/vm/mod.rs:4:12
[INFO] [stderr]   |
[INFO] [stderr] 4 | pub struct VirtualMachine {
[INFO] [stderr]   |            ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `new`
[INFO] [stderr]   --> src/vm/mod.rs:10:12
[INFO] [stderr]    |
[INFO] [stderr] 10 |     pub fn new(instructions: &ByteVec) -> VirtualMachine {
[INFO] [stderr]    |            ^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `collapse`
[INFO] [stderr]   --> src/lexer/type_handler.rs:46:12
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn collapse(&self) -> Option<Type> {
[INFO] [stderr]    |            ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `get_member_loc`
[INFO] [stderr]    --> src/lexer/type_handler.rs:115:8
[INFO] [stderr]     |
[INFO] [stderr] 115 |     fn get_member_loc(&self, scope_id: u32, var_name: &str) -> Option<u32> {
[INFO] [stderr]     |        ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `iter`
[INFO] [stderr]   --> src/vm/byte_vec.rs:54:12
[INFO] [stderr]    |
[INFO] [stderr] 54 |     pub fn iter(&self) -> ByteVecIterator {
[INFO] [stderr]    |            ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `push_byte_vec`
[INFO] [stderr]    --> src/vm/byte_vec.rs:133:12
[INFO] [stderr]     |
[INFO] [stderr] 133 |     pub fn push_byte_vec(&mut self, byte_vec: &ByteVec) {
[INFO] [stderr]     |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `language` (bin "language" test) generated 32 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.78s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/language-165bcd8b14a93e75)
[INFO] [stdout] 
[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" "7962bd3c239a5bac1f7f831b1c6f6ea45dff281999e134be5f1ad5bc7f4f2cb2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7962bd3c239a5bac1f7f831b1c6f6ea45dff281999e134be5f1ad5bc7f4f2cb2", kill_on_drop: false }`
[INFO] [stdout] 7962bd3c239a5bac1f7f831b1c6f6ea45dff281999e134be5f1ad5bc7f4f2cb2