[INFO] updating cached repository pzmarzly/x11-input-mirror
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/pzmarzly/x11-input-mirror
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/pzmarzly/x11-input-mirror" "work/ex/beta-1.38-1/sources/1.37.0/gh/pzmarzly/x11-input-mirror"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/pzmarzly/x11-input-mirror'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/pzmarzly/x11-input-mirror" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pzmarzly/x11-input-mirror"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pzmarzly/x11-input-mirror'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 261dac624f093ce1c0fed9915a68a7f6d3f8f65e
[INFO] sha for GitHub repo pzmarzly/x11-input-mirror: 261dac624f093ce1c0fed9915a68a7f6d3f8f65e
[INFO] validating manifest of pzmarzly/x11-input-mirror 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 pzmarzly/x11-input-mirror 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 pzmarzly/x11-input-mirror
[INFO] finished frobbing pzmarzly/x11-input-mirror
[INFO] frobbed toml for pzmarzly/x11-input-mirror written to work/ex/beta-1.38-1/sources/1.37.0/gh/pzmarzly/x11-input-mirror/Cargo.toml
[INFO] started frobbing pzmarzly/x11-input-mirror
[INFO] finished frobbing pzmarzly/x11-input-mirror
[INFO] frobbed toml for pzmarzly/x11-input-mirror written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/pzmarzly/x11-input-mirror/Cargo.toml
[INFO] crate pzmarzly/x11-input-mirror 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 pzmarzly/x11-input-mirror 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/pzmarzly/x11-input-mirror:/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] aba236d439d903a1f5e6439277ccfbf0206b88f5ef1d591256ea9108d4d2f728
[INFO] running `"docker" "start" "-a" "aba236d439d903a1f5e6439277ccfbf0206b88f5ef1d591256ea9108d4d2f728"`
[INFO] [stderr]    Compiling serde v1.0.86
[INFO] [stderr]    Compiling keystream v1.0.0
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]    Compiling syn v0.15.26
[INFO] [stderr]    Compiling block-buffer v0.7.2
[INFO] [stderr]    Compiling chacha v0.3.0
[INFO] [stderr]    Compiling sha3 v0.8.1
[INFO] [stderr]    Compiling serde_derive v1.0.86
[INFO] [stderr]    Compiling toml v0.4.10
[INFO] [stderr]    Compiling x11-input-mirror v0.3.6 (/opt/crater/workdir)
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(panic_info_message)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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(int_to_from_bytes)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[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 `x11-input-mirror`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "aba236d439d903a1f5e6439277ccfbf0206b88f5ef1d591256ea9108d4d2f728"`
[INFO] running `"docker" "rm" "-f" "aba236d439d903a1f5e6439277ccfbf0206b88f5ef1d591256ea9108d4d2f728"`
[INFO] [stdout] aba236d439d903a1f5e6439277ccfbf0206b88f5ef1d591256ea9108d4d2f728