[INFO] fetching crate thread_timer 0.3.0...
[INFO] checking thread_timer-0.3.0 against master#350d0ef0ec0493e6d21cfb265cb8211a0e74d766 for pr-145342-1
[INFO] extracting crate thread_timer 0.3.0 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate thread_timer 0.3.0
[INFO] finished tweaking crates.io crate thread_timer 0.3.0
[INFO] tweaked toml for crates.io crate thread_timer 0.3.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate thread_timer 0.3.0 on toolchain 350d0ef0ec0493e6d21cfb265cb8211a0e74d766
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "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" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9ce74e10b5655d080b5d2f8e4923f8d081a1c099e380df0b2a9f3f37b0ae45e5
[INFO] running `Command { std: "docker" "start" "-a" "9ce74e10b5655d080b5d2f8e4923f8d081a1c099e380df0b2a9f3f37b0ae45e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9ce74e10b5655d080b5d2f8e4923f8d081a1c099e380df0b2a9f3f37b0ae45e5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ce74e10b5655d080b5d2f8e4923f8d081a1c099e380df0b2a9f3f37b0ae45e5", kill_on_drop: false }`
[INFO] [stdout] 9ce74e10b5655d080b5d2f8e4923f8d081a1c099e380df0b2a9f3f37b0ae45e5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+350d0ef0ec0493e6d21cfb265cb8211a0e74d766" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f6927eaa0bca4536963e8804898946bec80dfbdd9128ea49056bdafbf570b8af
[INFO] running `Command { std: "docker" "start" "-a" "f6927eaa0bca4536963e8804898946bec80dfbdd9128ea49056bdafbf570b8af", kill_on_drop: false }`
[INFO] [stderr]     Checking thread_timer v0.3.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/lib.rs:240:13
[INFO] [stdout]     |
[INFO] [stdout] 240 |         let _ = is_waiting_condvar
[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] 240 |         let _unused = is_waiting_condvar
[INFO] [stdout]     |              ++++++
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 240 ~         drop(is_waiting_condvar
[INFO] [stdout] 241 |           .wait_while(is_waiting_lock.lock().unwrap(), |&mut is_waiting| {
[INFO] [stdout] 242 |             is_waiting
[INFO] [stdout] 243 |           })
[INFO] [stdout] 244 ~           .unwrap());
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `thread_timer` (lib test) 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:240:13
[INFO] [stdout]     |
[INFO] [stdout] 240 |         let _ = is_waiting_condvar
[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] 240 |         let _unused = is_waiting_condvar
[INFO] [stdout]     |              ++++++
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 240 ~         drop(is_waiting_condvar
[INFO] [stdout] 241 |           .wait_while(is_waiting_lock.lock().unwrap(), |&mut is_waiting| {
[INFO] [stdout] 242 |             is_waiting
[INFO] [stdout] 243 |           })
[INFO] [stdout] 244 ~           .unwrap());
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `thread_timer` (lib) due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "f6927eaa0bca4536963e8804898946bec80dfbdd9128ea49056bdafbf570b8af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f6927eaa0bca4536963e8804898946bec80dfbdd9128ea49056bdafbf570b8af", kill_on_drop: false }`
[INFO] [stdout] f6927eaa0bca4536963e8804898946bec80dfbdd9128ea49056bdafbf570b8af