[INFO] fetching crate isbn2 0.4.0...
[INFO] checking isbn2-0.4.0 against 1.55.0 for beta-1.56-3
[INFO] extracting crate isbn2 0.4.0 into /workspace/builds/worker-38/source
[INFO] validating manifest of crates.io crate isbn2 0.4.0 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 isbn2 0.4.0
[INFO] finished tweaking crates.io crate isbn2 0.4.0
[INFO] tweaked toml for crates.io crate isbn2 0.4.0 written to /workspace/builds/worker-38/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] [stderr]     Blocking waiting for file lock on package cache
[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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded codegen v0.1.3
[INFO] [stderr]   Downloaded quick-xml v0.20.0
[INFO] [stderr]   Downloaded xmlparser v0.13.3
[INFO] [stderr]   Downloaded roxmltree v0.13.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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] b61c83ddcf0ca11359aa43f68ee9257528fb07ff33d9dc0628dc57474313d96e
[INFO] running `Command { std: "docker" "start" "-a" "b61c83ddcf0ca11359aa43f68ee9257528fb07ff33d9dc0628dc57474313d96e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b61c83ddcf0ca11359aa43f68ee9257528fb07ff33d9dc0628dc57474313d96e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b61c83ddcf0ca11359aa43f68ee9257528fb07ff33d9dc0628dc57474313d96e", kill_on_drop: false }`
[INFO] [stdout] b61c83ddcf0ca11359aa43f68ee9257528fb07ff33d9dc0628dc57474313d96e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-38/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] f4de3950f085885d11cf8e174b3bdc23031a01f4994c8850d600ac37de0c8de3
[INFO] running `Command { std: "docker" "start" "-a" "f4de3950f085885d11cf8e174b3bdc23031a01f4994c8850d600ac37de0c8de3", kill_on_drop: false }`
[INFO] [stderr]    Compiling xmlparser v0.13.3
[INFO] [stderr]     Checking arrayvec v0.5.2
[INFO] [stderr]    Compiling indexmap v1.7.0
[INFO] [stderr]    Compiling roxmltree v0.13.1
[INFO] [stderr]    Compiling codegen v0.1.3
[INFO] [stderr]    Compiling isbn2 v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> benches/bench_convert.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]  --> benches/bench_convert.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use core::hint::black_box;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:11:30
[INFO] [stdout]    |
[INFO] [stdout] 11 |     let digits = Isbn10::new(black_box([9, 9, 7, 1, 5, 0, 2, 1, 0, 0])).unwrap();
[INFO] [stdout]    |                              ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:12:15
[INFO] [stdout]    |
[INFO] [stdout] 12 |     b.iter(|| black_box(digits.hyphenate()))
[INFO] [stdout]    |               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:17:30
[INFO] [stdout]    |
[INFO] [stdout] 17 |     let digits = Isbn13::new(black_box([9, 7, 8, 3, 1, 6, 1, 4, 8, 4, 1, 0, 0])).unwrap();
[INFO] [stdout]    |                              ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:18:15
[INFO] [stdout]    |
[INFO] [stdout] 18 |     b.iter(|| black_box(digits.hyphenate()))
[INFO] [stdout]    |               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:23:30
[INFO] [stdout]    |
[INFO] [stdout] 23 |     let digits = Isbn10::new(black_box([9, 9, 7, 1, 5, 0, 2, 1, 0, 0])).unwrap();
[INFO] [stdout]    |                              ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:24:15
[INFO] [stdout]    |
[INFO] [stdout] 24 |     b.iter(|| black_box(digits.to_string()))
[INFO] [stdout]    |               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:29:30
[INFO] [stdout]    |
[INFO] [stdout] 29 |     let digits = Isbn13::new(black_box([9, 7, 8, 3, 1, 6, 1, 4, 8, 4, 1, 0, 0])).unwrap();
[INFO] [stdout]    |                              ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:30:15
[INFO] [stdout]    |
[INFO] [stdout] 30 |     b.iter(|| black_box(digits.to_string()))
[INFO] [stdout]    |               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:35:15
[INFO] [stdout]    |
[INFO] [stdout] 35 |     let str = black_box("85-359-0277-5");
[INFO] [stdout]    |               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:36:15
[INFO] [stdout]    |
[INFO] [stdout] 36 |     b.iter(|| black_box(Isbn10::from_str(str)))
[INFO] [stdout]    |               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:41:15
[INFO] [stdout]    |
[INFO] [stdout] 41 |     let str = black_box("978-3-16-148410-0");
[INFO] [stdout]    |               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_convert.rs:42:15
[INFO] [stdout]    |
[INFO] [stdout] 42 |     b.iter(|| black_box(Isbn13::from_str(str)))
[INFO] [stdout]    |               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 14 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `isbn2` due to 15 previous errors
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> benches/bench_new.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]  --> benches/bench_new.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 | use core::hint::black_box;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_new.rs:10:15
[INFO] [stdout]    |
[INFO] [stdout] 10 |     b.iter(|| black_box(Isbn10::new(black_box([9, 9, 7, 1, 5, 0, 2, 1, 0, 0]))))
[INFO] [stdout]    |               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_new.rs:10:37
[INFO] [stdout]    |
[INFO] [stdout] 10 |     b.iter(|| black_box(Isbn10::new(black_box([9, 9, 7, 1, 5, 0, 2, 1, 0, 0]))))
[INFO] [stdout]    |                                     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_new.rs:16:9
[INFO] [stdout]    |
[INFO] [stdout] 16 |         black_box(Isbn13::new(black_box([
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_new.rs:16:31
[INFO] [stdout]    |
[INFO] [stdout] 16 |         black_box(Isbn13::new(black_box([
[INFO] [stdout]    |                               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_new.rs:24:13
[INFO] [stdout]    |
[INFO] [stdout] 24 |     let a = black_box(Isbn10::new([9, 9, 7, 1, 5, 0, 2, 1, 0, 0]).unwrap());
[INFO] [stdout]    |             ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature 'bench_black_box'
[INFO] [stdout]   --> benches/bench_new.rs:25:15
[INFO] [stdout]    |
[INFO] [stdout] 25 |     b.iter(|| black_box(Isbn13::from(a)))
[INFO] [stdout]    |               ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: see issue #64102 <https://github.com/rust-lang/rust/issues/64102> for more information
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 8 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "f4de3950f085885d11cf8e174b3bdc23031a01f4994c8850d600ac37de0c8de3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4de3950f085885d11cf8e174b3bdc23031a01f4994c8850d600ac37de0c8de3", kill_on_drop: false }`
[INFO] [stdout] f4de3950f085885d11cf8e174b3bdc23031a01f4994c8850d600ac37de0c8de3
