[INFO] fetching crate fffft 0.4.0...
[INFO] testing fffft-0.4.0 against 1.59.0 for beta-1.60-1
[INFO] extracting crate fffft 0.4.0 into /workspace/builds/worker-19/source
[INFO] validating manifest of crates.io crate fffft 0.4.0 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fffft 0.4.0
[INFO] finished tweaking crates.io crate fffft 0.4.0
[INFO] tweaked toml for crates.io crate fffft 0.4.0 written to /workspace/builds/worker-19/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8f986ff4fb69283180e07489b47a21b5910550deeaab5afe278eb2b09dd416e8
[INFO] running `Command { std: "docker" "start" "-a" "8f986ff4fb69283180e07489b47a21b5910550deeaab5afe278eb2b09dd416e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8f986ff4fb69283180e07489b47a21b5910550deeaab5afe278eb2b09dd416e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8f986ff4fb69283180e07489b47a21b5910550deeaab5afe278eb2b09dd416e8", kill_on_drop: false }`
[INFO] [stdout] 8f986ff4fb69283180e07489b47a21b5910550deeaab5afe278eb2b09dd416e8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-19/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d4e5ab48325c58438e82c35a4e806e2a8b9920c26703bbd63c74638ef1a87563
[INFO] running `Command { std: "docker" "start" "-a" "d4e5ab48325c58438e82c35a4e806e2a8b9920c26703bbd63c74638ef1a87563", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustversion v1.0.6
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]    Compiling tap v1.0.1
[INFO] [stderr]    Compiling funty v1.2.0
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling num-bigint v0.3.3
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling itertools v0.10.3
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling wyz v0.4.0
[INFO] [stderr]    Compiling bitvec v0.22.3
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling err-derive v0.2.4
[INFO] [stderr]    Compiling addchain v0.2.0
[INFO] [stderr]    Compiling ff_derive v0.10.0
[INFO] [stderr]    Compiling ff v0.10.1
[INFO] [stderr]    Compiling fffft v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:16:12
[INFO] [stdout]    |
[INFO] [stdout] 16 | #![feature(test)]
[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 `fffft` due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "d4e5ab48325c58438e82c35a4e806e2a8b9920c26703bbd63c74638ef1a87563", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4e5ab48325c58438e82c35a4e806e2a8b9920c26703bbd63c74638ef1a87563", kill_on_drop: false }`
[INFO] [stdout] d4e5ab48325c58438e82c35a4e806e2a8b9920c26703bbd63c74638ef1a87563