[INFO] updating cached repository stemjail/stemshim
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/stemjail/stemshim
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/stemjail/stemshim" "work/ex/beta-1.38-1/sources/1.37.0/gh/stemjail/stemshim"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/stemjail/stemshim'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/stemjail/stemshim" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/stemjail/stemshim"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/stemjail/stemshim'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] db856a3e8045ccdfab52fad5a023efa046afdfdb
[INFO] sha for GitHub repo stemjail/stemshim: db856a3e8045ccdfab52fad5a023efa046afdfdb
[INFO] validating manifest of stemjail/stemshim 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 stemjail/stemshim 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 stemjail/stemshim
[INFO] finished frobbing stemjail/stemshim
[INFO] frobbed toml for stemjail/stemshim written to work/ex/beta-1.38-1/sources/1.37.0/gh/stemjail/stemshim/Cargo.toml
[INFO] started frobbing stemjail/stemshim
[INFO] finished frobbing stemjail/stemshim
[INFO] frobbed toml for stemjail/stemshim written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/stemjail/stemshim/Cargo.toml
[INFO] crate stemjail/stemshim 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] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/stemjail/stemshim/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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 stemjail/stemshim 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/stemjail/stemshim:/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] 094716843b74d7a381ad801394a2243baeb8b6143e219a2a8500c06addb6dd9a
[INFO] running `"docker" "start" "-a" "094716843b74d7a381ad801394a2243baeb8b6143e219a2a8500c06addb6dd9a"`
[INFO] [stderr]    Compiling dot v0.1.4
[INFO] [stderr]    Compiling toml v0.1.30
[INFO] [stderr]    Compiling unix_socket v0.5.0
[INFO] [stderr]    Compiling fd v0.2.3
[INFO] [stderr]    Compiling mnt v0.3.1
[INFO] [stderr]    Compiling bincode v0.5.9
[INFO] [stderr]    Compiling tty v0.4.5
[INFO] [stderr]    Compiling fdpass v0.1.0
[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/tty-0.4.5/src/lib.rs:15:1
[INFO] [stderr]    |
[INFO] [stderr] 15 | #![feature(process_exec)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling stemflow v0.5.3
[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 `tty`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0463]: can't find crate for `collections`
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/stemflow-0.5.3/src/lib.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | extern crate collections;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^ can't find crate
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0463`.
[INFO] [stderr] error: Could not compile `stemflow`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "094716843b74d7a381ad801394a2243baeb8b6143e219a2a8500c06addb6dd9a"`
[INFO] running `"docker" "rm" "-f" "094716843b74d7a381ad801394a2243baeb8b6143e219a2a8500c06addb6dd9a"`
[INFO] [stdout] 094716843b74d7a381ad801394a2243baeb8b6143e219a2a8500c06addb6dd9a