[INFO] fetching crate excov 1.0.0...
[INFO] testing excov-1.0.0 against try#8de4c7234dd9b97c9d76b58671343fdbbc9a433e+target=x86_64-unknown-linux-musl for musl_upgrade_1_2_5_with_libc_patch_0
[INFO] extracting crate excov 1.0.0 into /workspace/builds/worker-2-tc1/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-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate excov 1.0.0 on toolchain 8de4c7234dd9b97c9d76b58671343fdbbc9a433e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "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" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a2d00011b8a5de132bd34ca6814638c668def79d3d5f654522acca6ed83e01cf
[INFO] running `Command { std: "docker" "start" "-a" "a2d00011b8a5de132bd34ca6814638c668def79d3d5f654522acca6ed83e01cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a2d00011b8a5de132bd34ca6814638c668def79d3d5f654522acca6ed83e01cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2d00011b8a5de132bd34ca6814638c668def79d3d5f654522acca6ed83e01cf", kill_on_drop: false }`
[INFO] [stdout] a2d00011b8a5de132bd34ca6814638c668def79d3d5f654522acca6ed83e01cf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "build" "--frozen" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] 7fb4fde268907ec3693b723c5eee904f181f53462520c7531ccdbe66e144bf3e
[INFO] running `Command { std: "docker" "start" "-a" "7fb4fde268907ec3693b723c5eee904f181f53462520c7531ccdbe66e144bf3e", kill_on_drop: false }`
[INFO] [stderr]    Compiling excov v1.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.17s
[INFO] running `Command { std: "docker" "inspect" "7fb4fde268907ec3693b723c5eee904f181f53462520c7531ccdbe66e144bf3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fb4fde268907ec3693b723c5eee904f181f53462520c7531ccdbe66e144bf3e", kill_on_drop: false }`
[INFO] [stdout] 7fb4fde268907ec3693b723c5eee904f181f53462520c7531ccdbe66e144bf3e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "test" "--frozen" "--no-run" "--message-format=json" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] f010ac73b707fe7063008ac4abcd41c226a7c5a97d0f221dc31a2367966d46b4
[INFO] running `Command { std: "docker" "start" "-a" "f010ac73b707fe7063008ac4abcd41c226a7c5a97d0f221dc31a2367966d46b4", kill_on_drop: false }`
[INFO] [stderr]    Compiling 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 `test` profile [unoptimized + debuginfo] target(s) in 1.02s
[INFO] running `Command { std: "docker" "inspect" "f010ac73b707fe7063008ac4abcd41c226a7c5a97d0f221dc31a2367966d46b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f010ac73b707fe7063008ac4abcd41c226a7c5a97d0f221dc31a2367966d46b4", kill_on_drop: false }`
[INFO] [stdout] f010ac73b707fe7063008ac4abcd41c226a7c5a97d0f221dc31a2367966d46b4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+8de4c7234dd9b97c9d76b58671343fdbbc9a433e" "test" "--frozen" "--target" "x86_64-unknown-linux-musl", kill_on_drop: false }`
[INFO] [stdout] cac4949486abcc17a43e6bf3c0a5abf25347c4d722a5bb2859f0a48069444eff
[INFO] running `Command { std: "docker" "start" "-a" "cac4949486abcc17a43e6bf3c0a5abf25347c4d722a5bb2859f0a48069444eff", kill_on_drop: false }`
[INFO] [stderr] warning: unused return value of `array::<impl [T; N]>::map` that must be used
[INFO] [stderr]     --> src/lib.rs:986:9
[INFO] [stderr]      |
[INFO] [stderr] 986  | /         [
[INFO] [stderr] 987  | |             GridVal {
[INFO] [stderr] 988  | |                 row: 1,
[INFO] [stderr] 989  | |                 col: 6,
[INFO] [stderr] ...    |
[INFO] [stderr] 1108 | |         .map(|id| problem.add_constraint([id]));
[INFO] [stderr]      | |_______________________________________________^
[INFO] [stderr]      |
[INFO] [stderr]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]      |
[INFO] [stderr] 986  |         let _ = [
[INFO] [stderr]      |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `excov` (lib test) generated 1 warning
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/x86_64-unknown-linux-musl/debug/deps/excov-225a18fc34d73749)
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tests::simple ... ok
[INFO] [stdout] test tests::sudoku ... ok
[INFO] [stdout] test tests::eight_queens ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "cac4949486abcc17a43e6bf3c0a5abf25347c4d722a5bb2859f0a48069444eff", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cac4949486abcc17a43e6bf3c0a5abf25347c4d722a5bb2859f0a48069444eff", kill_on_drop: false }`
[INFO] [stdout] cac4949486abcc17a43e6bf3c0a5abf25347c4d722a5bb2859f0a48069444eff