[INFO] crate prty 0.1.1 is already in cache
[INFO] testing prty-0.1.1 against 1.38.0 for beta-1.39-1
[INFO] extracting crate prty 0.1.1 into work/builds/worker-0/source
[INFO] validating manifest of crates.io crate prty 0.1.1 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate prty 0.1.1
[INFO] finished tweaking crates.io crate prty 0.1.1
[INFO] tweaked toml for crates.io crate prty 0.1.1 written to work/builds/worker-0/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] bce6580dcf4536cd16a65e3220ba98eb601f16b34d3fb100dd58da00f1363385
[INFO] running `"docker" "start" "-a" "bce6580dcf4536cd16a65e3220ba98eb601f16b34d3fb100dd58da00f1363385"`
[INFO] [stderr]    Compiling quick-error v0.1.4
[INFO] [stderr]    Compiling scopeguard v0.2.0
[INFO] [stderr]    Compiling prty_fmtmodifier v0.1.1
[INFO] [stderr]    Compiling compare v0.1.0
[INFO] [stderr]    Compiling libz-sys v1.0.25
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stderr]    Compiling libgit2-sys v0.4.6
[INFO] [stderr]    Compiling peg v0.5.7
[INFO] [stderr]    Compiling lzma-sys v0.1.15
[INFO] [stderr]    Compiling measure_time v0.6.0
[INFO] [stderr]    Compiling quickcheck v0.6.2
[INFO] [stderr]    Compiling map_in_place v0.1.0
[INFO] [stderr]    Compiling prty_bitgraph v0.1.1
[INFO] [stderr]    Compiling xz2 v0.1.6
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/prty_bitgraph-0.1.1/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(vec_remove_item)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling prefixopt v0.4.0
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `prty_bitgraph`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "bce6580dcf4536cd16a65e3220ba98eb601f16b34d3fb100dd58da00f1363385"`
[INFO] running `"docker" "rm" "-f" "bce6580dcf4536cd16a65e3220ba98eb601f16b34d3fb100dd58da00f1363385"`
[INFO] [stdout] bce6580dcf4536cd16a65e3220ba98eb601f16b34d3fb100dd58da00f1363385