[INFO] updating cached repository jwilm/racerd
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jwilm/racerd
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jwilm/racerd" "work/ex/beta-1.38-1/sources/1.37.0/gh/jwilm/racerd"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/jwilm/racerd'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jwilm/racerd" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jwilm/racerd"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jwilm/racerd'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6f74488e58e42314a36ff000bae796fe54c1bdd1
[INFO] sha for GitHub repo jwilm/racerd: 6f74488e58e42314a36ff000bae796fe54c1bdd1
[INFO] validating manifest of jwilm/racerd on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of jwilm/racerd on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing jwilm/racerd
[INFO] finished frobbing jwilm/racerd
[INFO] frobbed toml for jwilm/racerd written to work/ex/beta-1.38-1/sources/1.37.0/gh/jwilm/racerd/Cargo.toml
[INFO] started frobbing jwilm/racerd
[INFO] finished frobbing jwilm/racerd
[INFO] frobbed toml for jwilm/racerd written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/jwilm/racerd/Cargo.toml
[INFO] crate jwilm/racerd already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing jwilm/racerd against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/jwilm/racerd:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 5c7d610e6b97129f1b8fa72473c216f53ab7254186701d294c185068a460b957
[INFO] running `"docker" "start" "-a" "5c7d610e6b97129f1b8fa72473c216f53ab7254186701d294c185068a460b957"`
[INFO] [stderr]    Compiling rustc-rayon-core v0.1.2
[INFO] [stderr]    Compiling smallvec v0.6.9
[INFO] [stderr]    Compiling rustc-rayon v0.1.2
[INFO] [stderr]    Compiling syn v0.15.29
[INFO] [stderr]    Compiling rustc-ap-graphviz v407.0.0
[INFO] [stderr]    Compiling scoped-tls v1.0.0
[INFO] [stderr]    Compiling rustc-ap-rustc_target v407.0.0
[INFO] [stderr]    Compiling rustc-ap-syntax v407.0.0
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/rustc-ap-graphviz-407.0.0/lib.rs:279:1
[INFO] [stderr]     |
[INFO] [stderr] 279 | #![feature(rustc_private, nll)]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/smallvec-0.6.9/lib.rs:33:32
[INFO] [stderr]    |
[INFO] [stderr] 33 | #![cfg_attr(feature = "union", feature(untagged_unions))]
[INFO] [stderr]    |                                ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/smallvec-0.6.9/lib.rs:35:37
[INFO] [stderr]    |
[INFO] [stderr] 35 | #![cfg_attr(feature = "may_dangle", feature(dropck_eyepatch))]
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr]    Compiling rls-span v0.4.1
[INFO] [stderr] error: Could not compile `rustc-ap-graphviz`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `smallvec`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "5c7d610e6b97129f1b8fa72473c216f53ab7254186701d294c185068a460b957"`
[INFO] running `"docker" "rm" "-f" "5c7d610e6b97129f1b8fa72473c216f53ab7254186701d294c185068a460b957"`
[INFO] [stdout] 5c7d610e6b97129f1b8fa72473c216f53ab7254186701d294c185068a460b957