[INFO] updating cached repository MSleepyPanda/explain-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/MSleepyPanda/explain-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/MSleepyPanda/explain-rs" "work/ex/beta-1.38-1/sources/1.37.0/gh/MSleepyPanda/explain-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/MSleepyPanda/explain-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/MSleepyPanda/explain-rs" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MSleepyPanda/explain-rs"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MSleepyPanda/explain-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 10522cf5c80910dfa6a0c1db49360ecef247cf89
[INFO] sha for GitHub repo MSleepyPanda/explain-rs: 10522cf5c80910dfa6a0c1db49360ecef247cf89
[INFO] validating manifest of MSleepyPanda/explain-rs 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 MSleepyPanda/explain-rs 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 MSleepyPanda/explain-rs
[INFO] finished frobbing MSleepyPanda/explain-rs
[INFO] frobbed toml for MSleepyPanda/explain-rs written to work/ex/beta-1.38-1/sources/1.37.0/gh/MSleepyPanda/explain-rs/Cargo.toml
[INFO] started frobbing MSleepyPanda/explain-rs
[INFO] finished frobbing MSleepyPanda/explain-rs
[INFO] frobbed toml for MSleepyPanda/explain-rs written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/MSleepyPanda/explain-rs/Cargo.toml
[INFO] crate MSleepyPanda/explain-rs 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 MSleepyPanda/explain-rs 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/MSleepyPanda/explain-rs:/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] f54a43efb331abbb5a2f9dde925b56c734cf9b3c6a81613dfef9412bd6cc3363
[INFO] running `"docker" "start" "-a" "f54a43efb331abbb5a2f9dde925b56c734cf9b3c6a81613dfef9412bd6cc3363"`
[INFO] [stderr]    Compiling percent-encoding v1.0.1 (https://github.com/servo/rust-url#027450de)
[INFO] [stderr]    Compiling peresil v0.3.0 (https://github.com/shepmaster/peresil#6e4f794b)
[INFO] [stderr]    Compiling sha1 v0.3.0
[INFO] [stderr]    Compiling serde_json v1.0.8
[INFO] [stderr]    Compiling idna v0.1.4 (https://github.com/servo/rust-url#027450de)
[INFO] [stderr]    Compiling itertools v0.7.5
[INFO] [stderr]    Compiling fuzzy-pickles-derive v0.1.0 (https://github.com/shepmaster/fuzzy-pickles#abf5ae5b)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> /opt/crater/cargo-home/git/checkouts/peresil-7403d1c1394b7448/6e4f794/src/lib.rs:1:38
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![cfg_attr(feature = "combinators", feature(conservative_impl_trait))]
[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 `peresil`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "f54a43efb331abbb5a2f9dde925b56c734cf9b3c6a81613dfef9412bd6cc3363"`
[INFO] running `"docker" "rm" "-f" "f54a43efb331abbb5a2f9dde925b56c734cf9b3c6a81613dfef9412bd6cc3363"`
[INFO] [stdout] f54a43efb331abbb5a2f9dde925b56c734cf9b3c6a81613dfef9412bd6cc3363