[INFO] fetching crate ya-ring-buf 0.1.0...
[INFO] checking ya-ring-buf-0.1.0 against try#5c7108a2805ef56743d713d2789c5e802631c9e8 for pr-97739
[INFO] extracting crate ya-ring-buf 0.1.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate ya-ring-buf 0.1.0 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 ya-ring-buf 0.1.0
[INFO] finished tweaking crates.io crate ya-ring-buf 0.1.0
[INFO] tweaked toml for crates.io crate ya-ring-buf 0.1.0 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate ya-ring-buf 0.1.0 already has a lockfile, it will not be regenerated
[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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] fd806f9032488677f295da37899018a261fa137d738319dd0fcc31be1a4d5a3c
[INFO] running `Command { std: "docker" "start" "-a" "fd806f9032488677f295da37899018a261fa137d738319dd0fcc31be1a4d5a3c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd806f9032488677f295da37899018a261fa137d738319dd0fcc31be1a4d5a3c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd806f9032488677f295da37899018a261fa137d738319dd0fcc31be1a4d5a3c", kill_on_drop: false }`
[INFO] [stdout] fd806f9032488677f295da37899018a261fa137d738319dd0fcc31be1a4d5a3c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 7fcb067afec922ed2431347768d2af9b32596ab3ecec1e2fe7a5debf9cd4c7bc
[INFO] running `Command { std: "docker" "start" "-a" "7fcb067afec922ed2431347768d2af9b32596ab3ecec1e2fe7a5debf9cd4c7bc", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.37
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling syn v1.0.91
[INFO] [stderr]     Checking pin-project-lite v0.2.8
[INFO] [stderr]     Checking ya-ring-buf v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/waiter.rs:138:5
[INFO] [stdout]     |
[INFO] [stdout] 138 | /                 let _ = self
[INFO] [stdout] 139 | |                     .cond
[INFO] [stdout] 140 | |                     .wait_while(m, |_| !self.flag.swap(false, Ordering::Acquire))
[INFO] [stdout] 141 | |                     .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] 138 |                 let _unused = self
[INFO] [stdout]     |                     ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 138 ~                 drop(self
[INFO] [stdout] 139 |                     .cond
[INFO] [stdout] 140 |                     .wait_while(m, |_| !self.flag.swap(false, Ordering::Acquire))
[INFO] [stdout] 141 ~                     .unwrap());
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/waiter.rs:146:4
[INFO] [stdout]     |
[INFO] [stdout] 146 |             let _ = self.mutex.lock().unwrap();
[INFO] [stdout]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: consider binding to an unused variable to avoid immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 146 |             let _unused = self.mutex.lock().unwrap();
[INFO] [stdout]     |                 ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 146 |             drop(self.mutex.lock().unwrap());
[INFO] [stdout]     |             ~~~~~                          +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ya-ring-buf` due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "7fcb067afec922ed2431347768d2af9b32596ab3ecec1e2fe7a5debf9cd4c7bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fcb067afec922ed2431347768d2af9b32596ab3ecec1e2fe7a5debf9cd4c7bc", kill_on_drop: false }`
[INFO] [stdout] 7fcb067afec922ed2431347768d2af9b32596ab3ecec1e2fe7a5debf9cd4c7bc