[INFO] fetching crate mfcc 0.1.0...
[INFO] testing mfcc-0.1.0 against beta-2022-04-10 for beta-1.61-1
[INFO] extracting crate mfcc 0.1.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate mfcc 0.1.0 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 crates.io crate mfcc 0.1.0
[INFO] finished tweaking crates.io crate mfcc 0.1.0
[INFO] tweaked toml for crates.io crate mfcc 0.1.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-04-10" "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-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] dc250cef2d190d52d42cf63874a677a24a99b2a0f7eb5ba1e68c392aff6b02cc
[INFO] running `Command { std: "docker" "start" "-a" "dc250cef2d190d52d42cf63874a677a24a99b2a0f7eb5ba1e68c392aff6b02cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dc250cef2d190d52d42cf63874a677a24a99b2a0f7eb5ba1e68c392aff6b02cc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc250cef2d190d52d42cf63874a677a24a99b2a0f7eb5ba1e68c392aff6b02cc", kill_on_drop: false }`
[INFO] [stdout] dc250cef2d190d52d42cf63874a677a24a99b2a0f7eb5ba1e68c392aff6b02cc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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] f572a92610ceb7dae4fab7e072791fa3930c33de3db331a3f00a77bae7d4cecc
[INFO] running `Command { std: "docker" "start" "-a" "f572a92610ceb7dae4fab7e072791fa3930c33de3db331a3f00a77bae7d4cecc", kill_on_drop: false }`
[INFO] [stderr]    Compiling transpose v0.1.0
[INFO] [stderr]    Compiling strength_reduce v0.2.3
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling rustfft v3.0.1
[INFO] [stderr]    Compiling mfcc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(core_intrinsics)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(test)]
[INFO] [stdout]   |            ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mfcc` due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "f572a92610ceb7dae4fab7e072791fa3930c33de3db331a3f00a77bae7d4cecc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f572a92610ceb7dae4fab7e072791fa3930c33de3db331a3f00a77bae7d4cecc", kill_on_drop: false }`
[INFO] [stdout] f572a92610ceb7dae4fab7e072791fa3930c33de3db331a3f00a77bae7d4cecc