Dec 02 05:50:54.497 INFO testing Lireer/ricochet-robot-solver against master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61 for beta-1.31-5
Dec 02 05:50:54.497 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-5/worker-3/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-3/beta-1.31-5/master#8940af3cea4a9a9deabcaf843b2f8cad9a83fc61:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +8940af3cea4a9a9deabcaf843b2f8cad9a83fc61-alt build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 02 05:50:54.999 INFO [stdout] 404a1459db078b6cf925803d029bbb722989d0a5d23edffe2b3902697b4d059b
Dec 02 05:50:55.007 INFO running `"docker" "start" "-a" "404a1459db078b6cf925803d029bbb722989d0a5d23edffe2b3902697b4d059b"`
Dec 02 05:50:56.672 INFO [stderr] usermod: no changes
Dec 02 05:50:56.803 INFO [stderr]    Compiling num-complex v0.1.36
Dec 02 05:50:56.803 INFO [stderr]    Compiling ricochet_board v0.1.0 (/source/ricochet_board)
Dec 02 05:50:56.835 INFO [stderr]    Compiling num-bigint v0.1.36
Dec 02 05:50:58.210 INFO [stderr] warning: variable does not need to be mutable
Dec 02 05:50:58.211 INFO [stderr]    --> ricochet_board/src/lib.rs:261:19
Dec 02 05:50:58.211 INFO [stderr]     |
Dec 02 05:50:58.211 INFO [stderr] 261 |     fn fmt(&self, mut fmt: &mut fmt::Formatter) -> fmt::Result {
Dec 02 05:50:58.211 INFO [stderr]     |                   ----^^^
Dec 02 05:50:58.211 INFO [stderr]     |                   |
Dec 02 05:50:58.211 INFO [stderr]     |                   help: remove this `mut`
Dec 02 05:50:58.211 INFO [stderr]     |
Dec 02 05:50:58.211 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 02 05:50:58.211 INFO [stderr] 
Dec 02 05:50:58.215 INFO [stderr] warning: variable does not need to be mutable
Dec 02 05:50:58.215 INFO [stderr]    --> ricochet_board/src/lib.rs:272:19
Dec 02 05:50:58.215 INFO [stderr]     |
Dec 02 05:50:58.215 INFO [stderr] 272 |     fn fmt(&self, mut fmt: &mut fmt::Formatter) -> fmt::Result {
Dec 02 05:50:58.215 INFO [stderr]     |                   ----^^^
Dec 02 05:50:58.215 INFO [stderr]     |                   |
Dec 02 05:50:58.215 INFO [stderr]     |                   help: remove this `mut`
Dec 02 05:50:58.215 INFO [stderr] 
Dec 02 05:50:59.703 INFO [stderr]    Compiling num-rational v0.1.36
Dec 02 05:51:00.491 INFO [stderr]    Compiling num v0.1.37
Dec 02 05:51:01.107 INFO [stderr]    Compiling ricochet_solver v0.1.0 (/source/ricochet_solver)
Dec 02 05:51:01.936 INFO [stderr] error[E0554]: #![feature] may not be used on the beta release channel
Dec 02 05:51:01.936 INFO [stderr]  --> ricochet_solver/src/lib.rs:1:1
Dec 02 05:51:01.936 INFO [stderr]   |
Dec 02 05:51:01.936 INFO [stderr] 1 | #![feature(box_syntax)]
Dec 02 05:51:01.936 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^
Dec 02 05:51:01.936 INFO [stderr] 
Dec 02 05:51:01.936 INFO [stderr] error: aborting due to previous error
Dec 02 05:51:01.936 INFO [stderr] 
Dec 02 05:51:01.936 INFO [stderr] For more information about this error, try `rustc --explain E0554`.
Dec 02 05:51:01.945 INFO [stderr] error: Could not compile `ricochet_solver`.
Dec 02 05:51:01.945 INFO [stderr] 
Dec 02 05:51:01.945 INFO [stderr] To learn more, run the command again with --verbose.
Dec 02 05:51:01.945 INFO [stderr] su: No module specific data is present
Dec 02 05:51:02.443 INFO running `"docker" "inspect" "404a1459db078b6cf925803d029bbb722989d0a5d23edffe2b3902697b4d059b"`
Dec 02 05:51:02.696 INFO running `"docker" "rm" "-f" "404a1459db078b6cf925803d029bbb722989d0a5d23edffe2b3902697b4d059b"`
Dec 02 05:51:02.953 INFO [stdout] 404a1459db078b6cf925803d029bbb722989d0a5d23edffe2b3902697b4d059b