[INFO] fetching crate bounded-registers 0.1.1...
[INFO] testing bounded-registers-0.1.1 against 1.55.0 for beta-1.56-1
[INFO] extracting crate bounded-registers 0.1.1 into /workspace/builds/worker-51/source
[INFO] validating manifest of crates.io crate bounded-registers 0.1.1 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 bounded-registers 0.1.1
[INFO] finished tweaking crates.io crate bounded-registers 0.1.1
[INFO] tweaked toml for crates.io crate bounded-registers 0.1.1 written to /workspace/builds/worker-51/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] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "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-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 583a49085e997bed6988951f6d9ea049cceda573448c777392cca42f3d0773cd
[INFO] running `Command { std: "docker" "start" "-a" "583a49085e997bed6988951f6d9ea049cceda573448c777392cca42f3d0773cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "583a49085e997bed6988951f6d9ea049cceda573448c777392cca42f3d0773cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "583a49085e997bed6988951f6d9ea049cceda573448c777392cca42f3d0773cd", kill_on_drop: false }`
[INFO] [stdout] 583a49085e997bed6988951f6d9ea049cceda573448c777392cca42f3d0773cd
[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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 264dc33c98033b636a48c2747fb2da364342b1d838deb923c0bfdc61ce2567d2
[INFO] running `Command { std: "docker" "start" "-a" "264dc33c98033b636a48c2747fb2da364342b1d838deb923c0bfdc61ce2567d2", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling typenum v1.14.0
[INFO] [stderr]    Compiling bounded-registers v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0557]: feature has been removed
[INFO] [stdout]    --> src/lib.rs:315:12
[INFO] [stdout]     |
[INFO] [stdout] 315 | #![feature(const_fn)]
[INFO] [stdout]     |            ^^^^^^^^ feature has been removed
[INFO] [stdout]     |
[INFO] [stdout]     = note: split into finer-grained feature gates
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:315:1
[INFO] [stdout]     |
[INFO] [stdout] 315 | #![feature(const_fn)]
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `bounded-registers` due to 3 previous errors
[INFO] [stdout] Some errors have detailed explanations: E0554, E0557.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "264dc33c98033b636a48c2747fb2da364342b1d838deb923c0bfdc61ce2567d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "264dc33c98033b636a48c2747fb2da364342b1d838deb923c0bfdc61ce2567d2", kill_on_drop: false }`
[INFO] [stdout] 264dc33c98033b636a48c2747fb2da364342b1d838deb923c0bfdc61ce2567d2