[INFO] fetching crate vga 0.2.7...
[INFO] testing vga-0.2.7 against 1.59.0 for beta-1.60-1
[INFO] extracting crate vga 0.2.7 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate vga 0.2.7 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-4/source/rust-toolchain
[INFO] started tweaking crates.io crate vga 0.2.7
[INFO] finished tweaking crates.io crate vga 0.2.7
[INFO] tweaked toml for crates.io crate vga 0.2.7 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e4b069fcb609057f3e14c3503d86ab8bd06210cd95fd25dae395101f87ea15ec
[INFO] running `Command { std: "docker" "start" "-a" "e4b069fcb609057f3e14c3503d86ab8bd06210cd95fd25dae395101f87ea15ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e4b069fcb609057f3e14c3503d86ab8bd06210cd95fd25dae395101f87ea15ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e4b069fcb609057f3e14c3503d86ab8bd06210cd95fd25dae395101f87ea15ec", kill_on_drop: false }`
[INFO] [stdout] e4b069fcb609057f3e14c3503d86ab8bd06210cd95fd25dae395101f87ea15ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d1b1c0eaef28b1b1d4347ff959db3add8ad087cd1b3b07f3290c731b48793274
[INFO] running `Command { std: "docker" "start" "-a" "d1b1c0eaef28b1b1d4347ff959db3add8ad087cd1b3b07f3290c731b48793274", kill_on_drop: false }`
[INFO] [stderr]    Compiling x86_64 v0.14.8
[INFO] [stderr]    Compiling volatile v0.4.4
[INFO] [stderr]    Compiling conquer-util v0.3.0
[INFO] [stderr]    Compiling bit_field v0.10.1
[INFO] [stderr]    Compiling font8x8 v0.3.1
[INFO] [stderr]    Compiling lock_api v0.4.6
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/lock_api-0.4.6/src/lib.rs:93:34
[INFO] [stdout]    |
[INFO] [stdout] 93 | #![cfg_attr(feature = "nightly", feature(const_fn_trait_bound))]
[INFO] [stdout]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling conquer-once v0.3.2
[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 `lock_api` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "d1b1c0eaef28b1b1d4347ff959db3add8ad087cd1b3b07f3290c731b48793274", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1b1c0eaef28b1b1d4347ff959db3add8ad087cd1b3b07f3290c731b48793274", kill_on_drop: false }`
[INFO] [stdout] d1b1c0eaef28b1b1d4347ff959db3add8ad087cd1b3b07f3290c731b48793274