[INFO] updating cached repository https://github.com/Enigmatrix/minesweeper-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 79a2345405ec4fb1ea691f9f1d82447a5e7af228
[INFO] testing Enigmatrix/minesweeper-rust against beta-2019-09-28 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FEnigmatrix%2Fminesweeper-rust" "work/builds/worker-3/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-3/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Enigmatrix/minesweeper-rust on toolchain beta-2019-09-28
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Enigmatrix/minesweeper-rust
[INFO] finished tweaking git repo https://github.com/Enigmatrix/minesweeper-rust
[INFO] tweaked toml for git repo https://github.com/Enigmatrix/minesweeper-rust written to work/builds/worker-3/source/Cargo.toml
[INFO] crate git repo https://github.com/Enigmatrix/minesweeper-rust already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+beta-2019-09-28" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-09-28" "build" "--frozen"`
[INFO] [stdout] 3819c66df8b9fea8cd8617129acdf9ff65498e85a6bb76056b8b1cf476206b2b
[INFO] running `"docker" "start" "-a" "3819c66df8b9fea8cd8617129acdf9ff65498e85a6bb76056b8b1cf476206b2b"`
[INFO] [stderr]    Compiling rand v0.4.1
[INFO] [stderr]    Compiling phf_generator v0.7.21
[INFO] [stderr]    Compiling gl_generator v0.7.0
[INFO] [stderr]    Compiling tempfile v2.2.0
[INFO] [stderr]    Compiling rayon v0.8.2
[INFO] [stderr]    Compiling piston2d-graphics v0.24.0
[INFO] [stderr]    Compiling pistoncore-input v0.20.0
[INFO] [stderr]    Compiling phf_codegen v0.7.21
[INFO] [stderr]    Compiling target_build_utils v0.3.1
[INFO] [stderr]    Compiling gl v0.7.0
[INFO] [stderr]    Compiling jpeg-decoder v0.1.13
[INFO] [stderr]    Compiling pistoncore-window v0.30.0
[INFO] [stderr]    Compiling image v0.18.0
[INFO] [stderr]    Compiling pistoncore-event_loop v0.35.0
[INFO] [stderr]    Compiling piston v0.35.0
[INFO] [stderr]    Compiling libloading v0.3.4
[INFO] [stderr]    Compiling piston2d-opengl_graphics v0.50.0
[INFO] [stderr]    Compiling dlib v0.3.1
[INFO] [stderr]    Compiling wayland-sys v0.9.10
[INFO] [stderr]    Compiling wayland-client v0.9.10
[INFO] [stderr]    Compiling wayland-protocols v0.9.10
[INFO] [stderr]    Compiling wayland-kbd v0.9.1
[INFO] [stderr]    Compiling wayland-window v0.8.0
[INFO] [stderr]    Compiling winit v0.8.3
[INFO] [stderr]    Compiling glutin v0.10.1
[INFO] [stderr]    Compiling pistoncore-glutin_window v0.43.0
[INFO] [stderr]    Compiling minesweeper-rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(slice_patterns)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `piston::input::*`
[INFO] [stderr]   --> src/main.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 | use piston::input::*;
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `gameboardcontroller::*`
[INFO] [stderr]  --> src/gameboardview.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 | use gameboardcontroller::*;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `graphics::*`
[INFO] [stderr]  --> src/gameboardcontroller.rs:5:5
[INFO] [stderr]   |
[INFO] [stderr] 5 | use graphics::*;
[INFO] [stderr]   |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::io::*`
[INFO] [stderr]   --> src/main.rs:22:5
[INFO] [stderr]    |
[INFO] [stderr] 22 | use std::io::*;
[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 `minesweeper-rust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3819c66df8b9fea8cd8617129acdf9ff65498e85a6bb76056b8b1cf476206b2b"`
[INFO] running `"docker" "rm" "-f" "3819c66df8b9fea8cd8617129acdf9ff65498e85a6bb76056b8b1cf476206b2b"`
[INFO] [stdout] 3819c66df8b9fea8cd8617129acdf9ff65498e85a6bb76056b8b1cf476206b2b