[INFO] fetching crate transducers 0.0.2...
[INFO] checking transducers-0.0.2 against 1.55.0 for beta-1.56-3
[INFO] extracting crate transducers 0.0.2 into /workspace/builds/worker-98/source
[INFO] validating manifest of crates.io crate transducers 0.0.2 on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate transducers 0.0.2
[INFO] finished tweaking crates.io crate transducers 0.0.2
[INFO] tweaked toml for crates.io crate transducers 0.0.2 written to /workspace/builds/worker-98/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fba9c803c8aa5af20650b292ccfe6eac07b90805ea166c4b42487ae260319306
[INFO] running `Command { std: "docker" "start" "-a" "fba9c803c8aa5af20650b292ccfe6eac07b90805ea166c4b42487ae260319306", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fba9c803c8aa5af20650b292ccfe6eac07b90805ea166c4b42487ae260319306", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fba9c803c8aa5af20650b292ccfe6eac07b90805ea166c4b42487ae260319306", kill_on_drop: false }`
[INFO] [stdout] fba9c803c8aa5af20650b292ccfe6eac07b90805ea166c4b42487ae260319306
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 812d0ee78774c73ef36b6bea4539ff89ab42603fc547d5bdfdd12cb2cd832c8b
[INFO] running `Command { std: "docker" "start" "-a" "812d0ee78774c73ef36b6bea4539ff89ab42603fc547d5bdfdd12cb2cd832c8b", kill_on_drop: false }`
[INFO] [stderr]     Checking transducers v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:41:1
[INFO] [stdout]    |
[INFO] [stdout] 41 | #![feature(fn_traits, unboxed_closures)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:41:1
[INFO] [stdout]    |
[INFO] [stdout] 41 | #![feature(fn_traits, unboxed_closures)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/transform.rs:22:15
[INFO] [stdout]    |
[INFO] [stdout] 22 |     step: Box<Fn(R, T) -> R + 't>
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(R, T) -> R + 't`
[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/transform.rs:63:15
[INFO] [stdout]    |
[INFO] [stdout] 63 |     step: Box<Fn(R, T) -> R + 't>,
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(R, T) -> R + 't`
[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/transform.rs:116:15
[INFO] [stdout]     |
[INFO] [stdout] 116 |     step: Box<Fn(R, T) -> R + 't>,
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(R, T) -> R + 't`
[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/transform.rs:22:15
[INFO] [stdout]    |
[INFO] [stdout] 22 |     step: Box<Fn(R, T) -> R + 't>
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(R, T) -> R + 't`
[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/transform.rs:63:15
[INFO] [stdout]    |
[INFO] [stdout] 63 |     step: Box<Fn(R, T) -> R + 't>,
[INFO] [stdout]    |               ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(R, T) -> R + 't`
[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/transform.rs:116:15
[INFO] [stdout]     |
[INFO] [stdout] 116 |     step: Box<Fn(R, T) -> R + 't>,
[INFO] [stdout]     |               ^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(R, T) -> R + 't`
[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] error: aborting due to previous error; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `transducers` due to 2 previous errors; 3 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to previous error; 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "812d0ee78774c73ef36b6bea4539ff89ab42603fc547d5bdfdd12cb2cd832c8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "812d0ee78774c73ef36b6bea4539ff89ab42603fc547d5bdfdd12cb2cd832c8b", kill_on_drop: false }`
[INFO] [stdout] 812d0ee78774c73ef36b6bea4539ff89ab42603fc547d5bdfdd12cb2cd832c8b
