[INFO] fetching crate thread_timer 0.3.0...
[INFO] checking thread_timer-0.3.0 against try#5c7108a2805ef56743d713d2789c5e802631c9e8 for pr-97739
[INFO] extracting crate thread_timer 0.3.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate thread_timer 0.3.0 on toolchain 5c7108a2805ef56743d713d2789c5e802631c9e8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5c7108a2805ef56743d713d2789c5e802631c9e8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-3/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5c7108a2805ef56743d713d2789c5e802631c9e8" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+5c7108a2805ef56743d713d2789c5e802631c9e8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+5c7108a2805ef56743d713d2789c5e802631c9e8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cbaedf5ebc4543a39779c81a48fe89bd23ee50136738d1d561375ce72e010b21
[INFO] running `Command { std: "docker" "start" "-a" "cbaedf5ebc4543a39779c81a48fe89bd23ee50136738d1d561375ce72e010b21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cbaedf5ebc4543a39779c81a48fe89bd23ee50136738d1d561375ce72e010b21", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cbaedf5ebc4543a39779c81a48fe89bd23ee50136738d1d561375ce72e010b21", kill_on_drop: false }`
[INFO] [stdout] cbaedf5ebc4543a39779c81a48fe89bd23ee50136738d1d561375ce72e010b21
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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" "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:ac0d0aa6ec8ed129e241004a6179c99fa0d2616f50ba759c5b60bd26d0fafa02" "/opt/rustwide/cargo-home/bin/cargo" "+5c7108a2805ef56743d713d2789c5e802631c9e8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 709eabb8c8764db7c7b8ba5723ac72e3421f1832abee8f17b88dcdf26b412d69
[INFO] running `Command { std: "docker" "start" "-a" "709eabb8c8764db7c7b8ba5723ac72e3421f1832abee8f17b88dcdf26b412d69", 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:240:9
[INFO] [stdout]     |
[INFO] [stdout] 240 | /         let _ = 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]     = 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] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/lib.rs:240:9
[INFO] [stdout]     |
[INFO] [stdout] 240 | /         let _ = 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]     = 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] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `thread_timer` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `thread_timer` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "709eabb8c8764db7c7b8ba5723ac72e3421f1832abee8f17b88dcdf26b412d69", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "709eabb8c8764db7c7b8ba5723ac72e3421f1832abee8f17b88dcdf26b412d69", kill_on_drop: false }`
[INFO] [stdout] 709eabb8c8764db7c7b8ba5723ac72e3421f1832abee8f17b88dcdf26b412d69