[INFO] updating cached repository cohama/tapl
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/cohama/tapl
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/cohama/tapl" "work/ex/beta-1.38-1/sources/1.37.0/gh/cohama/tapl"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/cohama/tapl'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/cohama/tapl" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cohama/tapl"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cohama/tapl'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] b6024f7513a17686e8b0eceb0e81c06a07f1d269
[INFO] sha for GitHub repo cohama/tapl: b6024f7513a17686e8b0eceb0e81c06a07f1d269
[INFO] validating manifest of cohama/tapl 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 cohama/tapl 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 cohama/tapl
[INFO] finished frobbing cohama/tapl
[INFO] frobbed toml for cohama/tapl written to work/ex/beta-1.38-1/sources/1.37.0/gh/cohama/tapl/Cargo.toml
[INFO] started frobbing cohama/tapl
[INFO] finished frobbing cohama/tapl
[INFO] frobbed toml for cohama/tapl written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/cohama/tapl/Cargo.toml
[INFO] crate cohama/tapl 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 cohama/tapl 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/cohama/tapl:/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] e76d9776beb00f7ff96d1a6ba6aee9d2eca28a359502ee0a6f357cd4d37b0b37
[INFO] running `"docker" "start" "-a" "e76d9776beb00f7ff96d1a6ba6aee9d2eca28a359502ee0a6f357cd4d37b0b37"`
[INFO] [stderr]    Compiling tapl v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(box_syntax, box_patterns)]
[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 `tapl`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "e76d9776beb00f7ff96d1a6ba6aee9d2eca28a359502ee0a6f357cd4d37b0b37"`
[INFO] running `"docker" "rm" "-f" "e76d9776beb00f7ff96d1a6ba6aee9d2eca28a359502ee0a6f357cd4d37b0b37"`
[INFO] [stdout] e76d9776beb00f7ff96d1a6ba6aee9d2eca28a359502ee0a6f357cd4d37b0b37