[INFO] cloning repository https://github.com/danielq987/minigrep
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/danielq987/minigrep" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielq987%2Fminigrep", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielq987%2Fminigrep'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c21b6b240e9e21dfed871e373b8e66f1e59926bb
[INFO] testing danielq987/minigrep against master#62efba8a050c64249dab942951bb28f710208bc8 for pr-90799
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanielq987%2Fminigrep" "/workspace/builds/worker-98/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-98/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/danielq987/minigrep on toolchain 62efba8a050c64249dab942951bb28f710208bc8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/danielq987/minigrep
[INFO] finished tweaking git repo https://github.com/danielq987/minigrep
[INFO] tweaked toml for git repo https://github.com/danielq987/minigrep written to /workspace/builds/worker-98/source/Cargo.toml
[INFO] crate git repo https://github.com/danielq987/minigrep already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8d4a7e72e41c576e1947f895e9cafd67d1a5beb8e8e4dd91ccca03032151282a
[INFO] running `Command { std: "docker" "start" "-a" "8d4a7e72e41c576e1947f895e9cafd67d1a5beb8e8e4dd91ccca03032151282a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8d4a7e72e41c576e1947f895e9cafd67d1a5beb8e8e4dd91ccca03032151282a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d4a7e72e41c576e1947f895e9cafd67d1a5beb8e8e4dd91ccca03032151282a", kill_on_drop: false }`
[INFO] [stdout] 8d4a7e72e41c576e1947f895e9cafd67d1a5beb8e8e4dd91ccca03032151282a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-98/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:e8397a04204aaf8b9f284182a6f9e27a3c2e67044d0943b4415b160bfc957681" "/opt/rustwide/cargo-home/bin/cargo" "+62efba8a050c64249dab942951bb28f710208bc8" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 17e005f37f455624cfd605b9474de3dae5d7d83850f64a040a7f64c184a7e0c0
[INFO] running `Command { std: "docker" "start" "-a" "17e005f37f455624cfd605b9474de3dae5d7d83850f64a040a7f64c184a7e0c0", kill_on_drop: false }`
[INFO] [stderr]    Compiling minigrep v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/lib.rs:32:5
[INFO] [stdout]    |
[INFO] [stdout] 20 |     let c: &str = &contents.to_lowercase();
[INFO] [stdout]    |                    ----------------------- temporary value created here
[INFO] [stdout] ...
[INFO] [stdout] 32 |     matched_strings
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0515`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `minigrep` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "17e005f37f455624cfd605b9474de3dae5d7d83850f64a040a7f64c184a7e0c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "17e005f37f455624cfd605b9474de3dae5d7d83850f64a040a7f64c184a7e0c0", kill_on_drop: false }`
[INFO] [stdout] 17e005f37f455624cfd605b9474de3dae5d7d83850f64a040a7f64c184a7e0c0