[INFO] fetching crate const-buffer 0.1.2...
[INFO] testing const-buffer-0.1.2 against beta-2021-09-08 for beta-1.56-1
[INFO] extracting crate const-buffer 0.1.2 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate const-buffer 0.1.2 on toolchain beta-2021-09-08
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate const-buffer 0.1.2
[INFO] finished tweaking crates.io crate const-buffer 0.1.2
[INFO] tweaked toml for crates.io crate const-buffer 0.1.2 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-09-08" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta-2021-09-08" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7777c4ae071ad79dfbd333c495e664be4f7862dcaab860dbbf15a50817ff623e
[INFO] running `Command { std: "docker" "start" "-a" "7777c4ae071ad79dfbd333c495e664be4f7862dcaab860dbbf15a50817ff623e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7777c4ae071ad79dfbd333c495e664be4f7862dcaab860dbbf15a50817ff623e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7777c4ae071ad79dfbd333c495e664be4f7862dcaab860dbbf15a50817ff623e", kill_on_drop: false }`
[INFO] [stdout] 7777c4ae071ad79dfbd333c495e664be4f7862dcaab860dbbf15a50817ff623e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta-2021-09-08" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c80a024b734663fc2b963a5ffbd7c8991f92c0672f2f0ee1534bae5d813d2024
[INFO] running `Command { std: "docker" "start" "-a" "c80a024b734663fc2b963a5ffbd7c8991f92c0672f2f0ee1534bae5d813d2024", kill_on_drop: false }`
[INFO] [stderr]    Compiling const-buffer v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:62:1
[INFO] [stdout]    |
[INFO] [stdout] 62 | / #![feature(
[INFO] [stdout] 63 | |     associated_type_bounds,
[INFO] [stdout] 64 | |     const_fn_union,
[INFO] [stdout] 65 | |     min_const_generics,
[INFO] [stdout] ...  |
[INFO] [stdout] 70 | |     untagged_unions
[INFO] [stdout] 71 | | )]
[INFO] [stdout]    | |__^
[INFO] [stdout]    |
[INFO] [stdout]    = help: the feature `const_fn_union` has been stable since 1.56.0 and no longer requires an attribute to enable
[INFO] [stdout]    = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `const-buffer` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "c80a024b734663fc2b963a5ffbd7c8991f92c0672f2f0ee1534bae5d813d2024", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c80a024b734663fc2b963a5ffbd7c8991f92c0672f2f0ee1534bae5d813d2024", kill_on_drop: false }`
[INFO] [stdout] c80a024b734663fc2b963a5ffbd7c8991f92c0672f2f0ee1534bae5d813d2024