[INFO] fetching crate choir 0.7.0...
[INFO] checking choir-0.7.0 against master#39cb3386ddc6c71657418be28dbb3987eea4aa4b for pr-133536
[INFO] extracting crate choir 0.7.0 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate choir 0.7.0 on toolchain 39cb3386ddc6c71657418be28dbb3987eea4aa4b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate choir 0.7.0
[INFO] finished tweaking crates.io crate choir 0.7.0
[INFO] tweaked toml for crates.io crate choir 0.7.0 written to /workspace/builds/worker-3-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 81 packages to latest compatible versions
[INFO] [stderr]       Adding env_logger v0.9.3 (available: v0.11.5)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] eb460693c70624d1edb3e6948deb2fce2212f3f029d17efcb44cf4d50c718450
[INFO] running `Command { std: "docker" "start" "-a" "eb460693c70624d1edb3e6948deb2fce2212f3f029d17efcb44cf4d50c718450", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "eb460693c70624d1edb3e6948deb2fce2212f3f029d17efcb44cf4d50c718450", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eb460693c70624d1edb3e6948deb2fce2212f3f029d17efcb44cf4d50c718450", kill_on_drop: false }`
[INFO] [stdout] eb460693c70624d1edb3e6948deb2fce2212f3f029d17efcb44cf4d50c718450
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/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=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+39cb3386ddc6c71657418be28dbb3987eea4aa4b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 25eac25b709152f0bfe58e5eea13252e4aea009546cc2b17a5b205e1edb3fe72
[INFO] running `Command { std: "docker" "start" "-a" "25eac25b709152f0bfe58e5eea13252e4aea009546cc2b17a5b205e1edb3fe72", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.92
[INFO] [stderr]     Checking memchr v2.7.4
[INFO] [stderr]     Checking plotters v0.3.7
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking humantime v2.1.0
[INFO] [stderr]     Checking termcolor v1.4.1
[INFO] [stderr]     Checking aho-corasick v1.1.3
[INFO] [stderr]    Compiling quote v1.0.37
[INFO] [stderr]    Compiling syn v2.0.90
[INFO] [stderr]     Checking regex-automata v0.4.9
[INFO] [stderr]     Checking regex v1.11.1
[INFO] [stderr]     Checking env_logger v0.9.3
[INFO] [stderr]    Compiling serde_derive v1.0.215
[INFO] [stderr]    Compiling profiling-procmacros v1.0.16
[INFO] [stderr]     Checking profiling v1.0.16
[INFO] [stderr]     Checking choir v0.7.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary qualification
[INFO] [stdout]   --> src/lib.rs:54:28
[INFO] [stdout]    |
[INFO] [stdout] 54 | const MAX_WORKERS: usize = mem::size_of::<usize>() * BITS_PER_BYTE;
[INFO] [stdout]    |                            ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 31 |     unused_qualifications,
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] help: remove the unnecessary path segments
[INFO] [stdout]    |
[INFO] [stdout] 54 - const MAX_WORKERS: usize = mem::size_of::<usize>() * BITS_PER_BYTE;
[INFO] [stdout] 54 + const MAX_WORKERS: usize = size_of::<usize>() * BITS_PER_BYTE;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/lib.rs:709:17
[INFO] [stdout]     |
[INFO] [stdout] 709 |             let _ = condvar.wait_while(guard, |cont| cont.is_some());
[INFO] [stdout]     |                 ^ this lock is not assigned to a binding and is immediately dropped
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[deny(let_underscore_lock)]` on by default
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 709 |             let _unused = condvar.wait_while(guard, |cont| cont.is_some());
[INFO] [stdout]     |                 ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 709 |             drop(condvar.wait_while(guard, |cont| cont.is_some()));
[INFO] [stdout]     |             ~~~~~                                                +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `choir` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "25eac25b709152f0bfe58e5eea13252e4aea009546cc2b17a5b205e1edb3fe72", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "25eac25b709152f0bfe58e5eea13252e4aea009546cc2b17a5b205e1edb3fe72", kill_on_drop: false }`
[INFO] [stdout] 25eac25b709152f0bfe58e5eea13252e4aea009546cc2b17a5b205e1edb3fe72
