[INFO] cloning repository https://github.com/spaceships/combustion
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/spaceships/combustion" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspaceships%2Fcombustion", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspaceships%2Fcombustion'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ee4fead30bab95bf443462d69b07e52b7b5f361f
[INFO] checking spaceships/combustion against try#5c7108a2805ef56743d713d2789c5e802631c9e8 for pr-97739
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fspaceships%2Fcombustion" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/spaceships/combustion 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 git repo https://github.com/spaceships/combustion
[INFO] finished tweaking git repo https://github.com/spaceships/combustion
[INFO] tweaked toml for git repo https://github.com/spaceships/combustion written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/spaceships/combustion 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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 1cd18bfd9651a4f0b52c84a66c775974af396686a0d7b23054b876a200aa909c
[INFO] running `Command { std: "docker" "start" "-a" "1cd18bfd9651a4f0b52c84a66c775974af396686a0d7b23054b876a200aa909c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1cd18bfd9651a4f0b52c84a66c775974af396686a0d7b23054b876a200aa909c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1cd18bfd9651a4f0b52c84a66c775974af396686a0d7b23054b876a200aa909c", kill_on_drop: false }`
[INFO] [stdout] 1cd18bfd9651a4f0b52c84a66c775974af396686a0d7b23054b876a200aa909c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] f147f41729cefe889681c1c422d32c23689defdb6a29df3442794d7add67f865
[INFO] running `Command { std: "docker" "start" "-a" "f147f41729cefe889681c1c422d32c23689defdb6a29df3442794d7add67f865", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking unicode-width v0.1.7
[INFO] [stderr]     Checking regex-syntax v0.6.12
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking getopts v0.2.21
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking aho-corasick v0.7.6
[INFO] [stderr]     Checking num_cpus v1.11.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking regex v1.3.1
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]     Checking combustion v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/bin/benchmark.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let _ = main_signal.wait(main_mutex.lock().unwrap()).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] 20 |     let _unused = main_signal.wait(main_mutex.lock().unwrap()).unwrap();
[INFO] [stdout]    |         ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 20 |     drop(main_signal.wait(main_mutex.lock().unwrap()).unwrap());
[INFO] [stdout]    |     ~~~~~                                                     +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]   --> src/bin/benchmark.rs:20:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let _ = main_signal.wait(main_mutex.lock().unwrap()).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] 20 |     let _unused = main_signal.wait(main_mutex.lock().unwrap()).unwrap();
[INFO] [stdout]    |         ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]    |
[INFO] [stdout] 20 |     drop(main_signal.wait(main_mutex.lock().unwrap()).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 `combustion` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `combustion` due to 2 previous errors
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/bin/combustion.rs:171:21
[INFO] [stdout]     |
[INFO] [stdout] 171 |                     let _ = main_signal.wait(main_mutex.lock().unwrap()).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] 171 |                     let _unused = main_signal.wait(main_mutex.lock().unwrap()).unwrap();
[INFO] [stdout]     |                         ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 171 |                     drop(main_signal.wait(main_mutex.lock().unwrap()).unwrap());
[INFO] [stdout]     |                     ~~~~~                                                     +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `combustion` due to 2 previous errors
[INFO] [stdout] error: non-binding let on a synchronization lock
[INFO] [stdout]    --> src/bin/combustion.rs:171:21
[INFO] [stdout]     |
[INFO] [stdout] 171 |                     let _ = main_signal.wait(main_mutex.lock().unwrap()).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] 171 |                     let _unused = main_signal.wait(main_mutex.lock().unwrap()).unwrap();
[INFO] [stdout]     |                         ~~~~~~~
[INFO] [stdout] help: consider immediately dropping the value
[INFO] [stdout]     |
[INFO] [stdout] 171 |                     drop(main_signal.wait(main_mutex.lock().unwrap()).unwrap());
[INFO] [stdout]     |                     ~~~~~                                                     +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `combustion` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "f147f41729cefe889681c1c422d32c23689defdb6a29df3442794d7add67f865", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f147f41729cefe889681c1c422d32c23689defdb6a29df3442794d7add67f865", kill_on_drop: false }`
[INFO] [stdout] f147f41729cefe889681c1c422d32c23689defdb6a29df3442794d7add67f865