[INFO] fetching crate fast-floats 0.2.0...
[INFO] testing fast-floats-0.2.0 against 1.60.0 for beta-1.61-1
[INFO] extracting crate fast-floats 0.2.0 into /workspace/builds/worker-24/source
[INFO] validating manifest of crates.io crate fast-floats 0.2.0 on toolchain 1.60.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fast-floats 0.2.0
[INFO] finished tweaking crates.io crate fast-floats 0.2.0
[INFO] tweaked toml for crates.io crate fast-floats 0.2.0 written to /workspace/builds/worker-24/source/Cargo.toml
[INFO] crate crates.io crate fast-floats 0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.60.0" "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-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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" "+1.60.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 122967d323936f45fd3f862ce2f1e73b797682d66805cc591986d4414dba0f54
[INFO] running `Command { std: "docker" "start" "-a" "122967d323936f45fd3f862ce2f1e73b797682d66805cc591986d4414dba0f54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "122967d323936f45fd3f862ce2f1e73b797682d66805cc591986d4414dba0f54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "122967d323936f45fd3f862ce2f1e73b797682d66805cc591986d4414dba0f54", kill_on_drop: false }`
[INFO] [stdout] 122967d323936f45fd3f862ce2f1e73b797682d66805cc591986d4414dba0f54
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-24/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" "+1.60.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a81fcbe621da32a618c9468925bcb301ecbb9caee7135b50a8ad681e6a959013
[INFO] running `Command { std: "docker" "start" "-a" "a81fcbe621da32a618c9468925bcb301ecbb9caee7135b50a8ad681e6a959013", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling fast-floats v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:18:12
[INFO] [stdout]    |
[INFO] [stdout] 18 | #![feature(core_intrinsics)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^
[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 E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fast-floats` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "a81fcbe621da32a618c9468925bcb301ecbb9caee7135b50a8ad681e6a959013", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a81fcbe621da32a618c9468925bcb301ecbb9caee7135b50a8ad681e6a959013", kill_on_drop: false }`
[INFO] [stdout] a81fcbe621da32a618c9468925bcb301ecbb9caee7135b50a8ad681e6a959013