[INFO] updating cached repository emilio/searchfox-rustc-analyser
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/emilio/searchfox-rustc-analyser
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/emilio/searchfox-rustc-analyser" "work/ex/beta-1.38-1/sources/1.37.0/gh/emilio/searchfox-rustc-analyser"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/emilio/searchfox-rustc-analyser'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/emilio/searchfox-rustc-analyser" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/emilio/searchfox-rustc-analyser"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/emilio/searchfox-rustc-analyser'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 053686ff21cebf591dfe106d1d7c9f9bf3b04c93
[INFO] sha for GitHub repo emilio/searchfox-rustc-analyser: 053686ff21cebf591dfe106d1d7c9f9bf3b04c93
[INFO] validating manifest of emilio/searchfox-rustc-analyser 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 emilio/searchfox-rustc-analyser 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 emilio/searchfox-rustc-analyser
[INFO] finished frobbing emilio/searchfox-rustc-analyser
[INFO] frobbed toml for emilio/searchfox-rustc-analyser written to work/ex/beta-1.38-1/sources/1.37.0/gh/emilio/searchfox-rustc-analyser/Cargo.toml
[INFO] started frobbing emilio/searchfox-rustc-analyser
[INFO] finished frobbing emilio/searchfox-rustc-analyser
[INFO] frobbed toml for emilio/searchfox-rustc-analyser written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/emilio/searchfox-rustc-analyser/Cargo.toml
[INFO] crate emilio/searchfox-rustc-analyser 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 emilio/searchfox-rustc-analyser 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-7/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/emilio/searchfox-rustc-analyser:/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] 84dbebeb7b6aed163663cc42ca44bf8841a28558605e375bef98e866de4106d0
[INFO] running `"docker" "start" "-a" "84dbebeb7b6aed163663cc42ca44bf8841a28558605e375bef98e866de4106d0"`
[INFO] [stderr]    Compiling ansi_term v0.9.0
[INFO] [stderr]    Compiling serde v1.0.20
[INFO] [stderr]    Compiling rls-span v0.4.0
[INFO] [stderr]    Compiling atty v0.2.3
[INFO] [stderr]    Compiling syn v0.11.11
[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/rls-span-0.4.0/src/lib.rs:12:1
[INFO] [stderr]    |
[INFO] [stderr] 12 | #![feature(proc_macro)]
[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] error: Could not compile `rls-span`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "84dbebeb7b6aed163663cc42ca44bf8841a28558605e375bef98e866de4106d0"`
[INFO] running `"docker" "rm" "-f" "84dbebeb7b6aed163663cc42ca44bf8841a28558605e375bef98e866de4106d0"`
[INFO] [stdout] 84dbebeb7b6aed163663cc42ca44bf8841a28558605e375bef98e866de4106d0