[INFO] cloning repository https://github.com/AidoP/bluemetal
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/AidoP/bluemetal" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAidoP%2Fbluemetal", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAidoP%2Fbluemetal'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3f9fe625f0d8064a3eb77069773e9f4dac8d0ecb
[INFO] testing AidoP/bluemetal against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAidoP%2Fbluemetal" "/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/AidoP/bluemetal on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/AidoP/bluemetal
[INFO] finished tweaking git repo https://github.com/AidoP/bluemetal
[INFO] tweaked toml for git repo https://github.com/AidoP/bluemetal written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/AidoP/bluemetal already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1685e2d83d8298c64f7016fe37503ad854ad5171511e6fadbb4b341a3e0b1a16
[INFO] running `Command { std: "docker" "start" "-a" "1685e2d83d8298c64f7016fe37503ad854ad5171511e6fadbb4b341a3e0b1a16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1685e2d83d8298c64f7016fe37503ad854ad5171511e6fadbb4b341a3e0b1a16", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1685e2d83d8298c64f7016fe37503ad854ad5171511e6fadbb4b341a3e0b1a16", kill_on_drop: false }`
[INFO] [stdout] 1685e2d83d8298c64f7016fe37503ad854ad5171511e6fadbb4b341a3e0b1a16
[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=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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ea20920c1bbe384b91f3735abcca96f0438a85c7b450e1a980ab1f1864c25b9e
[INFO] running `Command { std: "docker" "start" "-a" "ea20920c1bbe384b91f3735abcca96f0438a85c7b450e1a980ab1f1864c25b9e", kill_on_drop: false }`
[INFO] [stderr]    Compiling bluemetal v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(str_split_once)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `HashSet`
[INFO] [stdout]  --> src/parse.rs:2:19
[INFO] [stdout]   |
[INFO] [stdout] 2 |     collections::{HashSet, HashMap, VecDeque},
[INFO] [stdout]   |                   ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused imports: `fs::File`, `io::Read`
[INFO] [stdout]  --> src/lib.rs:8:11
[INFO] [stdout]   |
[INFO] [stdout] 8 | use std::{fs::File, io::Read};
[INFO] [stdout]   |           ^^^^^^^^  ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bluemetal` due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "ea20920c1bbe384b91f3735abcca96f0438a85c7b450e1a980ab1f1864c25b9e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea20920c1bbe384b91f3735abcca96f0438a85c7b450e1a980ab1f1864c25b9e", kill_on_drop: false }`
[INFO] [stdout] ea20920c1bbe384b91f3735abcca96f0438a85c7b450e1a980ab1f1864c25b9e