[INFO] fetching crate mutex 1.0.0...
[INFO] checking mutex-1.0.0 against try#0fe3684930279e4d3be3aca66b30f82946ce9ac2 for pr-138340
[INFO] extracting crate mutex 1.0.0 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate mutex 1.0.0 on toolchain 0fe3684930279e4d3be3aca66b30f82946ce9ac2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0fe3684930279e4d3be3aca66b30f82946ce9ac2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mutex 1.0.0
[INFO] finished tweaking crates.io crate mutex 1.0.0
[INFO] tweaked toml for crates.io crate mutex 1.0.0 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0fe3684930279e4d3be3aca66b30f82946ce9ac2" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]      Locking 5 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+0fe3684930279e4d3be3aca66b30f82946ce9ac2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+0fe3684930279e4d3be3aca66b30f82946ce9ac2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] df1de81e51e21634dbce832faf1e7d4e16138335312d753420b7883afaac3505
[INFO] running `Command { std: "docker" "start" "-a" "df1de81e51e21634dbce832faf1e7d4e16138335312d753420b7883afaac3505", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "df1de81e51e21634dbce832faf1e7d4e16138335312d753420b7883afaac3505", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df1de81e51e21634dbce832faf1e7d4e16138335312d753420b7883afaac3505", kill_on_drop: false }`
[INFO] [stdout] df1de81e51e21634dbce832faf1e7d4e16138335312d753420b7883afaac3505
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+0fe3684930279e4d3be3aca66b30f82946ce9ac2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 41aaeedca864b0cf021e058b6c5c7883ff7584f4749728042b7a96200de0f8b0
[INFO] running `Command { std: "docker" "start" "-a" "41aaeedca864b0cf021e058b6c5c7883ff7584f4749728042b7a96200de0f8b0", kill_on_drop: false }`
[INFO] [stderr]    Compiling mutex v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking critical-section v1.2.0
[INFO] [stderr]     Checking mutex-traits v1.0.0
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]   --> src/raw_impls.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |         #[must_use]
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> src/raw_impls.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |         #[must_use]
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]   --> src/raw_impls.rs:50:9
[INFO] [stdout]    |
[INFO] [stdout] 50 |         #[must_use]
[INFO] [stdout]    |         ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> src/raw_impls.rs:114:9
[INFO] [stdout]     |
[INFO] [stdout] 114 |         #[must_use]
[INFO] [stdout]     |         ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.27s
[INFO] running `Command { std: "docker" "inspect" "41aaeedca864b0cf021e058b6c5c7883ff7584f4749728042b7a96200de0f8b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "41aaeedca864b0cf021e058b6c5c7883ff7584f4749728042b7a96200de0f8b0", kill_on_drop: false }`
[INFO] [stdout] 41aaeedca864b0cf021e058b6c5c7883ff7584f4749728042b7a96200de0f8b0