[INFO] fetching crate thread_timer 0.3.0...
[INFO] testing thread_timer-0.3.0 against try#2440211fe03bc45c89b6dc1a3df18382ce91e32b for pr-146098-1
[INFO] extracting crate thread_timer 0.3.0 into /workspace/builds/worker-1-tc2/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-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate thread_timer 0.3.0 on toolchain 2440211fe03bc45c89b6dc1a3df18382ce91e32b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "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" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "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" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cd0bd70debf2aa7a4074ffb1bbc46992a98235955b079595842c9c069452bed7
[INFO] running `Command { std: "docker" "start" "-a" "cd0bd70debf2aa7a4074ffb1bbc46992a98235955b079595842c9c069452bed7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cd0bd70debf2aa7a4074ffb1bbc46992a98235955b079595842c9c069452bed7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cd0bd70debf2aa7a4074ffb1bbc46992a98235955b079595842c9c069452bed7", kill_on_drop: false }`
[INFO] [stdout] cd0bd70debf2aa7a4074ffb1bbc46992a98235955b079595842c9c069452bed7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+2440211fe03bc45c89b6dc1a3df18382ce91e32b" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8b80f9a793d8b62018bb7cf084e59380bdc701ec6fd6ac3b04db2d238cb9d836
[INFO] running `Command { std: "docker" "start" "-a" "8b80f9a793d8b62018bb7cf084e59380bdc701ec6fd6ac3b04db2d238cb9d836", kill_on_drop: false }`
[INFO] [stderr]    Compiling 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)]` (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] 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" "8b80f9a793d8b62018bb7cf084e59380bdc701ec6fd6ac3b04db2d238cb9d836", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8b80f9a793d8b62018bb7cf084e59380bdc701ec6fd6ac3b04db2d238cb9d836", kill_on_drop: false }`
[INFO] [stdout] 8b80f9a793d8b62018bb7cf084e59380bdc701ec6fd6ac3b04db2d238cb9d836