[INFO] fetching crate breakpoint 0.1.0...
[INFO] testing breakpoint-0.1.0 against 1.55.0 for beta-1.56-1
[INFO] extracting crate breakpoint 0.1.0 into /workspace/builds/worker-20/source
[INFO] validating manifest of crates.io crate breakpoint 0.1.0 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 crates.io crate breakpoint 0.1.0
[INFO] finished tweaking crates.io crate breakpoint 0.1.0
[INFO] tweaked toml for crates.io crate breakpoint 0.1.0 written to /workspace/builds/worker-20/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.tags
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 7b2894954d07ca5f9cc9152ffefe1d232a2031e792086a015292f489231bb865
[INFO] running `Command { std: "docker" "start" "-a" "7b2894954d07ca5f9cc9152ffefe1d232a2031e792086a015292f489231bb865", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7b2894954d07ca5f9cc9152ffefe1d232a2031e792086a015292f489231bb865", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b2894954d07ca5f9cc9152ffefe1d232a2031e792086a015292f489231bb865", kill_on_drop: false }`
[INFO] [stdout] 7b2894954d07ca5f9cc9152ffefe1d232a2031e792086a015292f489231bb865
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-20/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] 66eadaa5bc3070f7c679532a7d4fb60fa987a392d49aa5dae0267428e25be6ca
[INFO] running `Command { std: "docker" "start" "-a" "66eadaa5bc3070f7c679532a7d4fb60fa987a392d49aa5dae0267428e25be6ca", kill_on_drop: false }`
[INFO] [stderr] warning: unused manifest key: package.tags
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling breakpoint 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:96:1
[INFO] [stdout]    |
[INFO] [stdout] 96 | #![feature(asm)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0517]: attribute should be applied to a struct, enum, or union
[INFO] [stdout]    --> src/lib.rs:129:12
[INFO] [stdout]     |
[INFO] [stdout] 129 |     #[repr(C)]
[INFO] [stdout]     |            ^
[INFO] [stdout] 130 |     type sig_t = extern "C" fn(i32);
[INFO] [stdout]     |     -------------------------------- not a struct, enum, or union
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0517, E0554.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0517`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `breakpoint` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "66eadaa5bc3070f7c679532a7d4fb60fa987a392d49aa5dae0267428e25be6ca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "66eadaa5bc3070f7c679532a7d4fb60fa987a392d49aa5dae0267428e25be6ca", kill_on_drop: false }`
[INFO] [stdout] 66eadaa5bc3070f7c679532a7d4fb60fa987a392d49aa5dae0267428e25be6ca