[INFO] cloning repository https://github.com/tosc-rs/scoped-mutex
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tosc-rs/scoped-mutex" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftosc-rs%2Fscoped-mutex", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftosc-rs%2Fscoped-mutex'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] de055b602302d095eabe9fa3da857049b0b0b5ec
[INFO] checking tosc-rs/scoped-mutex against try#099e089ab723e6ee96175f3496051098c60a4cd4 for pr-140208
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftosc-rs%2Fscoped-mutex" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tosc-rs/scoped-mutex on toolchain 099e089ab723e6ee96175f3496051098c60a4cd4
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+099e089ab723e6ee96175f3496051098c60a4cd4" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/tosc-rs/scoped-mutex
[INFO] finished tweaking git repo https://github.com/tosc-rs/scoped-mutex
[INFO] tweaked toml for git repo https://github.com/tosc-rs/scoped-mutex written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/tosc-rs/scoped-mutex already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+099e089ab723e6ee96175f3496051098c60a4cd4" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+099e089ab723e6ee96175f3496051098c60a4cd4" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fc9b2be98205dd061d8aaf3c902375dee34e303c57bf625b9e1a9b077f34731f
[INFO] running `Command { std: "docker" "start" "-a" "fc9b2be98205dd061d8aaf3c902375dee34e303c57bf625b9e1a9b077f34731f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fc9b2be98205dd061d8aaf3c902375dee34e303c57bf625b9e1a9b077f34731f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fc9b2be98205dd061d8aaf3c902375dee34e303c57bf625b9e1a9b077f34731f", kill_on_drop: false }`
[INFO] [stdout] fc9b2be98205dd061d8aaf3c902375dee34e303c57bf625b9e1a9b077f34731f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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:b0b074c097205a61b89e8ad263052f976b2b332c4dc5f02aef1fe52501660d6e" "/opt/rustwide/cargo-home/bin/cargo" "+099e089ab723e6ee96175f3496051098c60a4cd4" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 99f39279033c8cf9585f852174e3c481254e4356e921be2ca5aee30821c27053
[INFO] running `Command { std: "docker" "start" "-a" "99f39279033c8cf9585f852174e3c481254e4356e921be2ca5aee30821c27053", kill_on_drop: false }`
[INFO] [stderr]    Compiling mutex v1.0.0 (/opt/rustwide/workdir/source/mutex)
[INFO] [stderr]     Checking critical-section v1.1.2
[INFO] [stderr]     Checking mutex-traits v1.0.0 (/opt/rustwide/workdir/source/mutex-traits)
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> source/mutex-traits/src/lib.rs:129:5
[INFO] [stdout]     |
[INFO] [stdout] 129 |     #[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]    --> source/mutex-traits/src/lib.rs:129:5
[INFO] [stdout]     |
[INFO] [stdout] 129 |     #[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]   --> source/mutex/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]    --> source/mutex/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]   --> source/mutex/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]    --> source/mutex/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 0.31s
[INFO] running `Command { std: "docker" "inspect" "99f39279033c8cf9585f852174e3c481254e4356e921be2ca5aee30821c27053", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99f39279033c8cf9585f852174e3c481254e4356e921be2ca5aee30821c27053", kill_on_drop: false }`
[INFO] [stdout] 99f39279033c8cf9585f852174e3c481254e4356e921be2ca5aee30821c27053