[INFO] fetching crate excov 1.0.0...
[INFO] checking excov-1.0.0 against try#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608-1
[INFO] extracting crate excov 1.0.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate excov 1.0.0
[INFO] finished tweaking crates.io crate excov 1.0.0
[INFO] tweaked toml for crates.io crate excov 1.0.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate excov 1.0.0 on toolchain c659ee110de67e82444e4b6c8407c1a9af9c2cf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate excov 1.0.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f45339b25b2da11b780969966d0f7aafbd7790bfac598cbb239cbecf696bd75
[INFO] running `Command { std: "docker" "start" "-a" "8f45339b25b2da11b780969966d0f7aafbd7790bfac598cbb239cbecf696bd75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f45339b25b2da11b780969966d0f7aafbd7790bfac598cbb239cbecf696bd75", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f45339b25b2da11b780969966d0f7aafbd7790bfac598cbb239cbecf696bd75", kill_on_drop: false }`
[INFO] [stdout] 8f45339b25b2da11b780969966d0f7aafbd7790bfac598cbb239cbecf696bd75
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d9914f0437a088dc048d68001d2e3e5671431fed2534bd2ed0d9a725918f4d88
[INFO] running `Command { std: "docker" "start" "-a" "d9914f0437a088dc048d68001d2e3e5671431fed2534bd2ed0d9a725918f4d88", kill_on_drop: false }`
[INFO] [stderr]     Checking excov v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `array::<impl [T; N]>::map` that must be used
[INFO] [stdout]     --> src/lib.rs:986:9
[INFO] [stdout]      |
[INFO] [stdout]  986 | /         [
[INFO] [stdout]  987 | |             GridVal {
[INFO] [stdout]  988 | |                 row: 1,
[INFO] [stdout]  989 | |                 col: 6,
[INFO] [stdout] ...    |
[INFO] [stdout] 1108 | |         .map(|id| problem.add_constraint([id]));
[INFO] [stdout]      | |_______________________________________________^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]      |
[INFO] [stdout]  986 |         let _ = [
[INFO] [stdout]      |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "d9914f0437a088dc048d68001d2e3e5671431fed2534bd2ed0d9a725918f4d88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9914f0437a088dc048d68001d2e3e5671431fed2534bd2ed0d9a725918f4d88", kill_on_drop: false }`
[INFO] [stdout] d9914f0437a088dc048d68001d2e3e5671431fed2534bd2ed0d9a725918f4d88