[INFO] fetching crate bitboard 0.1.2...
[INFO] testing bitboard-0.1.2 against 1.54.0 for beta-1.55-1
[INFO] extracting crate bitboard 0.1.2 into /workspace/builds/worker-32/source
[INFO] validating manifest of crates.io crate bitboard 0.1.2 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate bitboard 0.1.2
[INFO] finished tweaking crates.io crate bitboard 0.1.2
[INFO] tweaked toml for crates.io crate bitboard 0.1.2 written to /workspace/builds/worker-32/source/Cargo.toml
[INFO] crate crates.io crate bitboard 0.1.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: file found to be present in multiple build targets: /workspace/builds/worker-32/source/tests/nqueens.rs
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded typenum v1.9.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/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" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 87c80d06dbe0f5f99437959ec8e63dab05e5d61961b273b4154b1be3e4f3be31
[INFO] running `Command { std: "docker" "start" "-a" "87c80d06dbe0f5f99437959ec8e63dab05e5d61961b273b4154b1be3e4f3be31", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "87c80d06dbe0f5f99437959ec8e63dab05e5d61961b273b4154b1be3e4f3be31", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "87c80d06dbe0f5f99437959ec8e63dab05e5d61961b273b4154b1be3e4f3be31", kill_on_drop: false }`
[INFO] [stdout] 87c80d06dbe0f5f99437959ec8e63dab05e5d61961b273b4154b1be3e4f3be31
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ce3ce07e160eac2b721e9b05b197ed842698d774fdd2bddef4afa7e5aa70902e
[INFO] running `Command { std: "docker" "start" "-a" "ce3ce07e160eac2b721e9b05b197ed842698d774fdd2bddef4afa7e5aa70902e", kill_on_drop: false }`
[INFO] [stderr] warning: file found to be present in multiple build targets: /opt/rustwide/workdir/tests/nqueens.rs
[INFO] [stderr]    Compiling typenum v1.9.0
[INFO] [stderr]    Compiling bitboard v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `std::heap`
[INFO] [stdout]   --> src/lib.rs:18:10
[INFO] [stdout]    |
[INFO] [stdout] 18 | use std::heap::{Alloc, Layout, Heap};
[INFO] [stdout]    |          ^^^^ could not find `heap` in `std`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(unique, alloc, heap_api, allocator_api, test)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bitboard`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "ce3ce07e160eac2b721e9b05b197ed842698d774fdd2bddef4afa7e5aa70902e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce3ce07e160eac2b721e9b05b197ed842698d774fdd2bddef4afa7e5aa70902e", kill_on_drop: false }`
[INFO] [stdout] ce3ce07e160eac2b721e9b05b197ed842698d774fdd2bddef4afa7e5aa70902e
