[INFO] updating cached repository dmit/keikaku
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/dmit/keikaku
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/dmit/keikaku" "work/ex/beta-1.37-6/sources/1.36.0/gh/dmit/keikaku"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/dmit/keikaku'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dmit/keikaku" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dmit/keikaku"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dmit/keikaku'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] dd5f9318c89e73b1af2c3776fad2a61e3150331c
[INFO] sha for GitHub repo dmit/keikaku: dd5f9318c89e73b1af2c3776fad2a61e3150331c
[INFO] validating manifest of dmit/keikaku on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of dmit/keikaku on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing dmit/keikaku
[INFO] finished frobbing dmit/keikaku
[INFO] frobbed toml for dmit/keikaku written to work/ex/beta-1.37-6/sources/1.36.0/gh/dmit/keikaku/Cargo.toml
[INFO] started frobbing dmit/keikaku
[INFO] finished frobbing dmit/keikaku
[INFO] frobbed toml for dmit/keikaku written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dmit/keikaku/Cargo.toml
[INFO] crate dmit/keikaku already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing dmit/keikaku against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/dmit/keikaku:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 3108a822e6f5e7f938b29d3531ceb94c8706a8aed4bbe8ba447dc7f371b54545
[INFO] running `"docker" "start" "-a" "3108a822e6f5e7f938b29d3531ceb94c8706a8aed4bbe8ba447dc7f371b54545"`
[INFO] [stderr]    Compiling keikaku 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:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(slice_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 `keikaku`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3108a822e6f5e7f938b29d3531ceb94c8706a8aed4bbe8ba447dc7f371b54545"`
[INFO] running `"docker" "rm" "-f" "3108a822e6f5e7f938b29d3531ceb94c8706a8aed4bbe8ba447dc7f371b54545"`
[INFO] [stdout] 3108a822e6f5e7f938b29d3531ceb94c8706a8aed4bbe8ba447dc7f371b54545