[INFO] fetching crate bitboard 0.1.2...
[INFO] testing bitboard-0.1.2 against 1.47.0 for beta-1.48-1
[INFO] extracting crate bitboard 0.1.2 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate bitboard 0.1.2 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", 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-9/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" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: file found to be present in multiple build targets: /workspace/builds/worker-9/source/tests/nqueens.rs
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a28c4e6a71dad0b0a61f51b54c2ab3554fc5c72e5f8a0a05305e355b51679a6f
[INFO] running `Command { std: "docker" "start" "-a" "a28c4e6a71dad0b0a61f51b54c2ab3554fc5c72e5f8a0a05305e355b51679a6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a28c4e6a71dad0b0a61f51b54c2ab3554fc5c72e5f8a0a05305e355b51679a6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a28c4e6a71dad0b0a61f51b54c2ab3554fc5c72e5f8a0a05305e355b51679a6f", kill_on_drop: false }`
[INFO] [stdout] a28c4e6a71dad0b0a61f51b54c2ab3554fc5c72e5f8a0a05305e355b51679a6f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f46370b85e385f027f98315ee80fe4e16594bc8646d58d6be01396e6673ea358
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "f46370b85e385f027f98315ee80fe4e16594bc8646d58d6be01396e6673ea358", 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" "f46370b85e385f027f98315ee80fe4e16594bc8646d58d6be01396e6673ea358", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f46370b85e385f027f98315ee80fe4e16594bc8646d58d6be01396e6673ea358", kill_on_drop: false }`
[INFO] [stdout] f46370b85e385f027f98315ee80fe4e16594bc8646d58d6be01396e6673ea358
