[INFO] fetching crate combu 1.1.23...
[INFO] checking combu-1.1.23 against master#f167efad2f51088d86180ee89177b3d7c9e7c2f5 for pr-129543
[INFO] extracting crate combu 1.1.23 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate combu 1.1.23 on toolchain f167efad2f51088d86180ee89177b3d7c9e7c2f5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] removed /workspace/builds/worker-0-tc1/source/.cargo/config
[INFO] started tweaking crates.io crate combu 1.1.23
[INFO] finished tweaking crates.io crate combu 1.1.23
[INFO] tweaked toml for crates.io crate combu 1.1.23 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate crates.io crate combu 1.1.23 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" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f1a4881a0647ea958471ab9227fc5b5dbbc2a3db94800434310c2d3a8b10a2d8
[INFO] running `Command { std: "docker" "start" "-a" "f1a4881a0647ea958471ab9227fc5b5dbbc2a3db94800434310c2d3a8b10a2d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f1a4881a0647ea958471ab9227fc5b5dbbc2a3db94800434310c2d3a8b10a2d8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f1a4881a0647ea958471ab9227fc5b5dbbc2a3db94800434310c2d3a8b10a2d8", kill_on_drop: false }`
[INFO] [stdout] f1a4881a0647ea958471ab9227fc5b5dbbc2a3db94800434310c2d3a8b10a2d8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+f167efad2f51088d86180ee89177b3d7c9e7c2f5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c727fc19471f8d614c9df783b929410caeb1f8f4191bd864104e7b0aa03a4b8f
[INFO] running `Command { std: "docker" "start" "-a" "c727fc19471f8d614c9df783b929410caeb1f8f4191bd864104e7b0aa03a4b8f", kill_on_drop: false }`
[INFO] [stderr]     Checking combu v1.1.23 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]     --> src/parser.rs:1705:5
[INFO] [stdout]      |
[INFO] [stdout] 1705 |                 format!("The flag --{} is an unknown flag.", flag_arg.name());
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]      = note: this warning originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]     --> src/parser.rs:1705:5
[INFO] [stdout]      |
[INFO] [stdout] 1705 |                 format!("The flag --{} is an unknown flag.", flag_arg.name());
[INFO] [stdout]      |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]      |
[INFO] [stdout]      = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]      = note: this warning originates in the macro `format` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.51s
[INFO] running `Command { std: "docker" "inspect" "c727fc19471f8d614c9df783b929410caeb1f8f4191bd864104e7b0aa03a4b8f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c727fc19471f8d614c9df783b929410caeb1f8f4191bd864104e7b0aa03a4b8f", kill_on_drop: false }`
[INFO] [stdout] c727fc19471f8d614c9df783b929410caeb1f8f4191bd864104e7b0aa03a4b8f