[INFO] fetching crate libgrep-rs 0.1.4...
[INFO] checking libgrep-rs-0.1.4 against master#db1fb85cff63ad5fffe435e17128f99f9e1d970c for pr-89056
[INFO] extracting crate libgrep-rs 0.1.4 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate libgrep-rs 0.1.4 on toolchain db1fb85cff63ad5fffe435e17128f99f9e1d970c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate libgrep-rs 0.1.4
[INFO] finished tweaking crates.io crate libgrep-rs 0.1.4
[INFO] tweaked toml for crates.io crate libgrep-rs 0.1.4 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate libgrep-rs 0.1.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] f758c8879ee44106bf14996eed8c16506ab0ddfcb191408661653e9b3f1f9e41
[INFO] running `Command { std: "docker" "start" "-a" "f758c8879ee44106bf14996eed8c16506ab0ddfcb191408661653e9b3f1f9e41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f758c8879ee44106bf14996eed8c16506ab0ddfcb191408661653e9b3f1f9e41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f758c8879ee44106bf14996eed8c16506ab0ddfcb191408661653e9b3f1f9e41", kill_on_drop: false }`
[INFO] [stdout] f758c8879ee44106bf14996eed8c16506ab0ddfcb191408661653e9b3f1f9e41
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+db1fb85cff63ad5fffe435e17128f99f9e1d970c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 574a6e52b928211bd95e604c5ced29cdf49ae576f9e0efa08c5e978bf996d08e
[INFO] running `Command { std: "docker" "start" "-a" "574a6e52b928211bd95e604c5ced29cdf49ae576f9e0efa08c5e978bf996d08e", kill_on_drop: false }`
[INFO] [stderr]     Checking regex v1.3.7
[INFO] [stderr]     Checking libgrep-rs v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/lib.rs:179:13
[INFO] [stdout]     |
[INFO] [stdout] 179 |         let mut return_text: String = searcher.search();
[INFO] [stdout]     |             ----^^^^^^^^^^^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.72s
[INFO] running `Command { std: "docker" "inspect" "574a6e52b928211bd95e604c5ced29cdf49ae576f9e0efa08c5e978bf996d08e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "574a6e52b928211bd95e604c5ced29cdf49ae576f9e0efa08c5e978bf996d08e", kill_on_drop: false }`
[INFO] [stdout] 574a6e52b928211bd95e604c5ced29cdf49ae576f9e0efa08c5e978bf996d08e