[INFO] updating cached repository ujh/iomrascalai
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ujh/iomrascalai
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ujh/iomrascalai" "work/ex/beta-1.38-1/sources/1.37.0/gh/ujh/iomrascalai"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ujh/iomrascalai'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ujh/iomrascalai" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ujh/iomrascalai"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ujh/iomrascalai'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 2b01a7643b9c4a86f1430a9ec38deb786e6a2fd8
[INFO] sha for GitHub repo ujh/iomrascalai: 2b01a7643b9c4a86f1430a9ec38deb786e6a2fd8
[INFO] validating manifest of ujh/iomrascalai 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 ujh/iomrascalai 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 ujh/iomrascalai
[INFO] finished frobbing ujh/iomrascalai
[INFO] frobbed toml for ujh/iomrascalai written to work/ex/beta-1.38-1/sources/1.37.0/gh/ujh/iomrascalai/Cargo.toml
[INFO] started frobbing ujh/iomrascalai
[INFO] finished frobbing ujh/iomrascalai
[INFO] frobbed toml for ujh/iomrascalai written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ujh/iomrascalai/Cargo.toml
[INFO] crate ujh/iomrascalai 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 ujh/iomrascalai 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-5/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/ujh/iomrascalai:/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] f9e0af721ba6a690b797516fb3e37c8ca08858f50403376155fd1f91e8a34582
[INFO] running `"docker" "start" "-a" "f9e0af721ba6a690b797516fb3e37c8ca08858f50403376155fd1f91e8a34582"`
[INFO] [stderr]    Compiling iomrascalai v0.3.2 (/opt/crater/workdir)
[INFO] [stderr]    Compiling serde v1.0.23
[INFO] [stderr]    Compiling quicksort v1.1.0
[INFO] [stderr]    Compiling getopts v0.2.15
[INFO] [stderr]    Compiling rand v0.3.18
[INFO] [stderr]    Compiling num_cpus v1.7.0
[INFO] [stderr] warning[E0503]: cannot use `state` because it was mutably borrowed
[INFO] [stderr]     --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/getopts-0.2.15/src/lib.rs:1033:33
[INFO] [stderr]      |
[INFO] [stderr] 978  |     let mut machine = |cont: &mut bool, (i, c): (usize, char)| {
[INFO] [stderr]      |                       ---------------------------------------- borrow of `state` occurs here
[INFO] [stderr] ...
[INFO] [stderr] 982  |         state = match (state, whitespace, limit) {
[INFO] [stderr]      |                        ----- borrow occurs due to use of `state` in closure
[INFO] [stderr] ...
[INFO] [stderr] 1033 |     while cont && match state { B | C => true, A => false } {
[INFO] [stderr]      |                                 ^ use of borrowed `state`
[INFO] [stderr] 1034 |         machine(&mut cont, (fake_i, ' '));
[INFO] [stderr]      |         ------- borrow later used here
[INFO] [stderr]      |
[INFO] [stderr]      = warning: this error has been downgraded to a warning for backwards compatibility with previous releases
[INFO] [stderr]      = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future
[INFO] [stderr]      = note: for more information, try `rustc --explain E0729`
[INFO] [stderr] 
[INFO] [stderr]    Compiling num-bigint v0.1.41
[INFO] [stderr]    Compiling num-rational v0.1.40
[INFO] [stderr]    Compiling num v0.1.41
[INFO] [stderr]    Compiling toml v0.4.5
[INFO] [stderr] error: cannot find macro `select!` in this scope
[INFO] [stderr]    --> src/engine/worker/mod.rs:138:13
[INFO] [stderr]     |
[INFO] [stderr] 138 |             select!(
[INFO] [stderr]     |             ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> src/main.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | #![feature(mpsc_select)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> src/main.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 | #![feature(plugin)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> src/main.rs:25:1
[INFO] [stderr]    |
[INFO] [stderr] 25 | #![feature(test)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `iomrascalai`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "f9e0af721ba6a690b797516fb3e37c8ca08858f50403376155fd1f91e8a34582"`
[INFO] running `"docker" "rm" "-f" "f9e0af721ba6a690b797516fb3e37c8ca08858f50403376155fd1f91e8a34582"`
[INFO] [stdout] f9e0af721ba6a690b797516fb3e37c8ca08858f50403376155fd1f91e8a34582