[INFO] cloning repository https://github.com/mebble/narrator
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/mebble/narrator" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmebble%2Fnarrator", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmebble%2Fnarrator'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3f8cb8d85d4e1d2cc88bec980a48f202aa50de03
[INFO] testing mebble/narrator against beta-2022-04-10 for beta-1.61-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmebble%2Fnarrator" "/workspace/builds/worker-51/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-51/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/mebble/narrator on toolchain beta-2022-04-10
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/mebble/narrator
[INFO] finished tweaking git repo https://github.com/mebble/narrator
[INFO] tweaked toml for git repo https://github.com/mebble/narrator written to /workspace/builds/worker-51/source/Cargo.toml
[INFO] crate git repo https://github.com/mebble/narrator already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2d8c2b2addf199cf49a77595b8e73629e522074656162eb0496c74111ba030f5
[INFO] running `Command { std: "docker" "start" "-a" "2d8c2b2addf199cf49a77595b8e73629e522074656162eb0496c74111ba030f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2d8c2b2addf199cf49a77595b8e73629e522074656162eb0496c74111ba030f5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2d8c2b2addf199cf49a77595b8e73629e522074656162eb0496c74111ba030f5", kill_on_drop: false }`
[INFO] [stdout] 2d8c2b2addf199cf49a77595b8e73629e522074656162eb0496c74111ba030f5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/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=warn" "-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:b0c94ce3c1162fcb8e57cac5b65ec2f72eabb1eebea4fcc35e269e823f681646" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-04-10" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3b6c432f711110064c99eb95ee6585bccc734007983c31ba6877d504e6e94e0c
[INFO] running `Command { std: "docker" "start" "-a" "3b6c432f711110064c99eb95ee6585bccc734007983c31ba6877d504e6e94e0c", kill_on_drop: false }`
[INFO] [stderr]    Compiling linked-hash-map v0.5.3
[INFO] [stderr]    Compiling yaml-rust v0.4.4
[INFO] [stderr]    Compiling narrator v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `first_entry`
[INFO] [stdout]   --> src/main.rs:18:13
[INFO] [stdout]    |
[INFO] [stdout] 18 |         let first_entry = map.as_hash().unwrap()
[INFO] [stdout]    |             ^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_first_entry`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow data in a `&` reference as mutable
[INFO] [stdout]   --> src/main.rs:18:27
[INFO] [stdout]    |
[INFO] [stdout] 18 |           let first_entry = map.as_hash().unwrap()
[INFO] [stdout]    |  ___________________________^
[INFO] [stdout] 19 | |             .entries().next().unwrap();
[INFO] [stdout]    | |______________________^ cannot borrow as mutable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `narrator` due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "3b6c432f711110064c99eb95ee6585bccc734007983c31ba6877d504e6e94e0c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b6c432f711110064c99eb95ee6585bccc734007983c31ba6877d504e6e94e0c", kill_on_drop: false }`
[INFO] [stdout] 3b6c432f711110064c99eb95ee6585bccc734007983c31ba6877d504e6e94e0c