[INFO] cloning repository https://github.com/postcss-rs/postcss-autoprefixer
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/postcss-rs/postcss-autoprefixer" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpostcss-rs%2Fpostcss-autoprefixer", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpostcss-rs%2Fpostcss-autoprefixer'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dd7c9178951b7d5f8b099259cecee19ad7bd67c4
[INFO] testing postcss-rs/postcss-autoprefixer against 1.59.0 for beta-1.60-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fpostcss-rs%2Fpostcss-autoprefixer" "/workspace/builds/worker-18/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-18/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/postcss-rs/postcss-autoprefixer 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 git repo https://github.com/postcss-rs/postcss-autoprefixer
[INFO] finished tweaking git repo https://github.com/postcss-rs/postcss-autoprefixer
[INFO] tweaked toml for git repo https://github.com/postcss-rs/postcss-autoprefixer written to /workspace/builds/worker-18/source/Cargo.toml
[INFO] crate git repo https://github.com/postcss-rs/postcss-autoprefixer already has a lockfile, it will not be regenerated
[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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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] b61a87032a6482c2d1612829cebabe8f61d8b0c8117e1b2a26f9fc6c45964de2
[INFO] running `Command { std: "docker" "start" "-a" "b61a87032a6482c2d1612829cebabe8f61d8b0c8117e1b2a26f9fc6c45964de2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b61a87032a6482c2d1612829cebabe8f61d8b0c8117e1b2a26f9fc6c45964de2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b61a87032a6482c2d1612829cebabe8f61d8b0c8117e1b2a26f9fc6c45964de2", kill_on_drop: false }`
[INFO] [stdout] b61a87032a6482c2d1612829cebabe8f61d8b0c8117e1b2a26f9fc6c45964de2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-18/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] 9d0d19f923e6f40be9092d9a43d1da6b318c11b4af8073e907965e77af025be6
[INFO] running `Command { std: "docker" "start" "-a" "9d0d19f923e6f40be9092d9a43d1da6b318c11b4af8073e907965e77af025be6", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling cty v0.2.2
[INFO] [stderr]    Compiling smallvec v1.7.0
[INFO] [stderr]    Compiling mimalloc-rust-sys v1.7.2
[INFO] [stderr]    Compiling codespan-reporting v0.11.1
[INFO] [stderr]    Compiling ropey v1.3.1
[INFO] [stderr]    Compiling tokenizer v0.0.2 (https://github.com/postcss-rs/postcss-rs#c4b6a969)
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling mimalloc-rust v0.1.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/mimalloc-rust-0.1.1/src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(allocator_api)]
[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 `mimalloc-rust` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "9d0d19f923e6f40be9092d9a43d1da6b318c11b4af8073e907965e77af025be6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9d0d19f923e6f40be9092d9a43d1da6b318c11b4af8073e907965e77af025be6", kill_on_drop: false }`
[INFO] [stdout] 9d0d19f923e6f40be9092d9a43d1da6b318c11b4af8073e907965e77af025be6