[INFO] fetching crate synfuzz 0.1.0...
[INFO] checking synfuzz-0.1.0 against master#5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f for pr-87248
[INFO] extracting crate synfuzz 0.1.0 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate synfuzz 0.1.0 on toolchain 5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate synfuzz 0.1.0
[INFO] finished tweaking crates.io crate synfuzz 0.1.0
[INFO] tweaked toml for crates.io crate synfuzz 0.1.0 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ee9c1190d7877954a4bbc64f5d64ca250f93448cde9d203cae6df54ec1894a61
[INFO] running `Command { std: "docker" "start" "-a" "ee9c1190d7877954a4bbc64f5d64ca250f93448cde9d203cae6df54ec1894a61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ee9c1190d7877954a4bbc64f5d64ca250f93448cde9d203cae6df54ec1894a61", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee9c1190d7877954a4bbc64f5d64ca250f93448cde9d203cae6df54ec1894a61", kill_on_drop: false }`
[INFO] [stdout] ee9c1190d7877954a4bbc64f5d64ca250f93448cde9d203cae6df54ec1894a61
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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=forbid" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+5a8a44196b3cf099f8c9b0156bd902eaec0b4e5f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1a2badd10f962c996309332393167f11f6ab4fc2716405b3a59cc4c71ba18c71
[INFO] running `Command { std: "docker" "start" "-a" "1a2badd10f962c996309332393167f11f6ab4fc2716405b3a59cc4c71ba18c71", kill_on_drop: false }`
[INFO] [stderr]    Compiling log v0.4.14
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]     Checking rand v0.5.6
[INFO] [stderr]     Checking synfuzz v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/combinator.rs:22:26
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub choices: Vec<Box<Generator>>,
[INFO] [stdout]    |                          ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/combinator.rs:55:32
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn choice(choices: Vec<Box<Generator>>) -> impl Generator {
[INFO] [stdout]    |                                ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/combinator.rs:62:24
[INFO] [stdout]    |
[INFO] [stdout] 62 |     pub generator: Box<Generator>,
[INFO] [stdout]    |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/combinator.rs:90:24
[INFO] [stdout]    |
[INFO] [stdout] 90 |     pub generator: Box<Generator>,
[INFO] [stdout]    |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:119:24
[INFO] [stdout]     |
[INFO] [stdout] 119 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:157:47
[INFO] [stdout]     |
[INFO] [stdout] 157 |     pub rules: Arc<RwLock<HashMap<String, Box<Generator>>>>,
[INFO] [stdout]     |                                               ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:212:38
[INFO] [stdout]     |
[INFO] [stdout] 212 | pub type Rules = HashMap<String, Box<Generator>>;
[INFO] [stdout]     |                                      ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:220:29
[INFO] [stdout]     |
[INFO] [stdout] 220 |     pub generators: Vec<Box<Generator>>,
[INFO] [stdout]     |                             ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:238:32
[INFO] [stdout]     |
[INFO] [stdout] 238 | pub fn seq(generators: Vec<Box<Generator>>) -> impl Generator {
[INFO] [stdout]     |                                ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:249:24
[INFO] [stdout]     |
[INFO] [stdout] 249 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:288:24
[INFO] [stdout]     |
[INFO] [stdout] 288 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:323:29
[INFO] [stdout]     |
[INFO] [stdout] 323 |     pub generators: Vec<Box<Generator>>,
[INFO] [stdout]     |                             ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:324:24
[INFO] [stdout]     |
[INFO] [stdout] 324 |     pub delimiter: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:357:25
[INFO] [stdout]     |
[INFO] [stdout] 357 |     generators: Vec<Box<Generator>>,
[INFO] [stdout]     |                         ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:371:24
[INFO] [stdout]     |
[INFO] [stdout] 371 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:372:24
[INFO] [stdout]     |
[INFO] [stdout] 372 |     pub separator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:418:24
[INFO] [stdout]     |
[INFO] [stdout] 418 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:419:24
[INFO] [stdout]     |
[INFO] [stdout] 419 |     pub separator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:465:24
[INFO] [stdout]     |
[INFO] [stdout] 465 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/combinator.rs:22:26
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub choices: Vec<Box<Generator>>,
[INFO] [stdout]    |                          ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/combinator.rs:55:32
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub fn choice(choices: Vec<Box<Generator>>) -> impl Generator {
[INFO] [stdout]    |                                ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/combinator.rs:62:24
[INFO] [stdout]    |
[INFO] [stdout] 62 |     pub generator: Box<Generator>,
[INFO] [stdout]    |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/combinator.rs:90:24
[INFO] [stdout]    |
[INFO] [stdout] 90 |     pub generator: Box<Generator>,
[INFO] [stdout]    |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:119:24
[INFO] [stdout]     |
[INFO] [stdout] 119 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:157:47
[INFO] [stdout]     |
[INFO] [stdout] 157 |     pub rules: Arc<RwLock<HashMap<String, Box<Generator>>>>,
[INFO] [stdout]     |                                               ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:212:38
[INFO] [stdout]     |
[INFO] [stdout] 212 | pub type Rules = HashMap<String, Box<Generator>>;
[INFO] [stdout]     |                                      ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:220:29
[INFO] [stdout]     |
[INFO] [stdout] 220 |     pub generators: Vec<Box<Generator>>,
[INFO] [stdout]     |                             ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:238:32
[INFO] [stdout]     |
[INFO] [stdout] 238 | pub fn seq(generators: Vec<Box<Generator>>) -> impl Generator {
[INFO] [stdout]     |                                ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:249:24
[INFO] [stdout]     |
[INFO] [stdout] 249 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:288:24
[INFO] [stdout]     |
[INFO] [stdout] 288 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:323:29
[INFO] [stdout]     |
[INFO] [stdout] 323 |     pub generators: Vec<Box<Generator>>,
[INFO] [stdout]     |                             ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:324:24
[INFO] [stdout]     |
[INFO] [stdout] 324 |     pub delimiter: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:357:25
[INFO] [stdout]     |
[INFO] [stdout] 357 |     generators: Vec<Box<Generator>>,
[INFO] [stdout]     |                         ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:371:24
[INFO] [stdout]     |
[INFO] [stdout] 371 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:372:24
[INFO] [stdout]     |
[INFO] [stdout] 372 |     pub separator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:418:24
[INFO] [stdout]     |
[INFO] [stdout] 418 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:419:24
[INFO] [stdout]     |
[INFO] [stdout] 419 |     pub separator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/combinator.rs:465:24
[INFO] [stdout]     |
[INFO] [stdout] 465 |     pub generator: Box<Generator>,
[INFO] [stdout]     |                        ^^^^^^^^^ help: use `dyn`: `dyn Generator`
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> examples/expression.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.41s
[INFO] running `Command { std: "docker" "inspect" "1a2badd10f962c996309332393167f11f6ab4fc2716405b3a59cc4c71ba18c71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a2badd10f962c996309332393167f11f6ab4fc2716405b3a59cc4c71ba18c71", kill_on_drop: false }`
[INFO] [stdout] 1a2badd10f962c996309332393167f11f6ab4fc2716405b3a59cc4c71ba18c71