[INFO] fetching crate monotonic-timer 1.0.0...
[INFO] testing monotonic-timer-1.0.0 against master#c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38 for pr-146098-8
[INFO] extracting crate monotonic-timer 1.0.0 into /workspace/builds/worker-2-tc1/source
[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-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate monotonic-timer 1.0.0 on toolchain c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "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" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 999bc1e843e044595660eaa2269fe26f6cd34cea2ff1b03c44bec55685bb668c
[INFO] running `Command { std: "docker" "start" "-a" "999bc1e843e044595660eaa2269fe26f6cd34cea2ff1b03c44bec55685bb668c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "999bc1e843e044595660eaa2269fe26f6cd34cea2ff1b03c44bec55685bb668c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "999bc1e843e044595660eaa2269fe26f6cd34cea2ff1b03c44bec55685bb668c", kill_on_drop: false }`
[INFO] [stdout] 999bc1e843e044595660eaa2269fe26f6cd34cea2ff1b03c44bec55685bb668c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+c90bcb9571b7aab0d8beaa2ce8a998ffaf079d38" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 14744b376673d6c3d77d94cc5ac9edf5c7a30d19f7aa899eb442dc207603cf2c
[INFO] running `Command { std: "docker" "start" "-a" "14744b376673d6c3d77d94cc5ac9edf5c7a30d19f7aa899eb442dc207603cf2c", kill_on_drop: false }`
[INFO] [stderr]    Compiling 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)]` (part of `#[deny(let_underscore)]`) 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 -                     let _ = waiter.condvar.wait(lock);
[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] running `Command { std: "docker" "inspect" "14744b376673d6c3d77d94cc5ac9edf5c7a30d19f7aa899eb442dc207603cf2c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14744b376673d6c3d77d94cc5ac9edf5c7a30d19f7aa899eb442dc207603cf2c", kill_on_drop: false }`
[INFO] [stdout] 14744b376673d6c3d77d94cc5ac9edf5c7a30d19f7aa899eb442dc207603cf2c