[INFO] fetching crate monotonic-timer 1.0.0...
[INFO] checking monotonic-timer-1.0.0 against try#31561a63598a0f21fc74c024747ef1310fdd2eb2 for pr-133536
[INFO] extracting crate monotonic-timer 1.0.0 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate monotonic-timer 1.0.0 on toolchain 31561a63598a0f21fc74c024747ef1310fdd2eb2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+31561a63598a0f21fc74c024747ef1310fdd2eb2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate monotonic-timer 1.0.0
[INFO] finished tweaking crates.io crate monotonic-timer 1.0.0
[INFO] tweaked toml for crates.io crate monotonic-timer 1.0.0 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+31561a63598a0f21fc74c024747ef1310fdd2eb2" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+31561a63598a0f21fc74c024747ef1310fdd2eb2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+31561a63598a0f21fc74c024747ef1310fdd2eb2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2ef0913e36bacea2a7520040637e79bfed3e44d511e30cc45b2e796e7e71cdcf
[INFO] running `Command { std: "docker" "start" "-a" "2ef0913e36bacea2a7520040637e79bfed3e44d511e30cc45b2e796e7e71cdcf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2ef0913e36bacea2a7520040637e79bfed3e44d511e30cc45b2e796e7e71cdcf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ef0913e36bacea2a7520040637e79bfed3e44d511e30cc45b2e796e7e71cdcf", kill_on_drop: false }`
[INFO] [stdout] 2ef0913e36bacea2a7520040637e79bfed3e44d511e30cc45b2e796e7e71cdcf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4a844ea9eb2546a2d2c7022eacef16ef2e8229c7fbb2c7d4d55a9ceca922f72d" "/opt/rustwide/cargo-home/bin/cargo" "+31561a63598a0f21fc74c024747ef1310fdd2eb2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b31740610f78e434cffc7d92d809c30f8c78ba0fe94c68c4a4338559ec5bbaf8
[INFO] running `Command { std: "docker" "start" "-a" "b31740610f78e434cffc7d92d809c30f8c78ba0fe94c68c4a4338559ec5bbaf8", kill_on_drop: false }`
[INFO] [stderr]     Checking monotonic-timer v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/lib.rs:228:25
[INFO] [stdout]     |
[INFO] [stdout] 228 |                     let _ = waiter.condvar.wait(lock);
[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] 228 |                     let _unused = waiter.condvar.wait(lock);
[INFO] [stdout]     |                         ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 228 |                     drop(waiter.condvar.wait(lock));
[INFO] [stdout]     |                     ~~~~~                         +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `monotonic-timer` (lib) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/lib.rs:228:25
[INFO] [stdout]     |
[INFO] [stdout] 228 |                     let _ = waiter.condvar.wait(lock);
[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] 228 |                     let _unused = waiter.condvar.wait(lock);
[INFO] [stdout]     |                         ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 228 |                     drop(waiter.condvar.wait(lock));
[INFO] [stdout]     |                     ~~~~~                         +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `monotonic-timer` (lib test) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "b31740610f78e434cffc7d92d809c30f8c78ba0fe94c68c4a4338559ec5bbaf8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b31740610f78e434cffc7d92d809c30f8c78ba0fe94c68c4a4338559ec5bbaf8", kill_on_drop: false }`
[INFO] [stdout] b31740610f78e434cffc7d92d809c30f8c78ba0fe94c68c4a4338559ec5bbaf8
