[INFO] cloning repository https://github.com/deciduously/bfrs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/deciduously/bfrs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdeciduously%2Fbfrs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdeciduously%2Fbfrs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 929605551861b3508a7b760359db98cb121b93c3
[INFO] checking deciduously/bfrs against master#8007b506ac5da629f223b755f5a5391edd5f6d01 for pr-88041
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdeciduously%2Fbfrs" "/workspace/builds/worker-15/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-15/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/deciduously/bfrs on toolchain 8007b506ac5da629f223b755f5a5391edd5f6d01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/deciduously/bfrs
[INFO] finished tweaking git repo https://github.com/deciduously/bfrs
[INFO] tweaked toml for git repo https://github.com/deciduously/bfrs written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/deciduously/bfrs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "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-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c19f36d3524e345c4cbfbe909b33ff21d32bc0a91bf6f849f309f728e4bc07c0
[INFO] running `Command { std: "docker" "start" "-a" "c19f36d3524e345c4cbfbe909b33ff21d32bc0a91bf6f849f309f728e4bc07c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c19f36d3524e345c4cbfbe909b33ff21d32bc0a91bf6f849f309f728e4bc07c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c19f36d3524e345c4cbfbe909b33ff21d32bc0a91bf6f849f309f728e4bc07c0", kill_on_drop: false }`
[INFO] [stdout] c19f36d3524e345c4cbfbe909b33ff21d32bc0a91bf6f849f309f728e4bc07c0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+8007b506ac5da629f223b755f5a5391edd5f6d01" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1fcca554a64d3d54dac3adc7e1d5b1bd23c49f36e0863aa2f650ab4ec611a0e6
[INFO] running `Command { std: "docker" "start" "-a" "1fcca554a64d3d54dac3adc7e1d5b1bd23c49f36e0863aa2f650ab4ec611a0e6", kill_on_drop: false }`
[INFO] [stderr]     Checking bfrs v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused borrow that must be used
[INFO] [stdout]   --> src/test.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 30 |     &test_machine.increment(1);
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^ the borrow produces a value
[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] 30 |     let _ = &test_machine.increment(1);
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.79s
[INFO] running `Command { std: "docker" "inspect" "1fcca554a64d3d54dac3adc7e1d5b1bd23c49f36e0863aa2f650ab4ec611a0e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fcca554a64d3d54dac3adc7e1d5b1bd23c49f36e0863aa2f650ab4ec611a0e6", kill_on_drop: false }`
[INFO] [stdout] 1fcca554a64d3d54dac3adc7e1d5b1bd23c49f36e0863aa2f650ab4ec611a0e6