[INFO] updating cached repository https://github.com/Morgandel/picross-solver
[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] 8de26c881761697ae73766224e8f43ff5b7bd38d
[INFO] testing Morgandel/picross-solver against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2FMorgandel%2Fpicross-solver" "work/builds/worker-10/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-10/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Morgandel/picross-solver on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Morgandel/picross-solver
[INFO] finished tweaking git repo https://github.com/Morgandel/picross-solver
[INFO] tweaked toml for git repo https://github.com/Morgandel/picross-solver written to work/builds/worker-10/source/Cargo.toml
[INFO] crate git repo https://github.com/Morgandel/picross-solver already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-10/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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 585dd65392a0d238164ef2a3841a21118611e349ccc378c0f4bb1a7be569a4a9
[INFO] running `"docker" "start" "-a" "585dd65392a0d238164ef2a3841a21118611e349ccc378c0f4bb1a7be569a4a9"`
[INFO] [stderr]    Compiling picross-solver v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `File`
[INFO] [stderr]  --> src/main.rs:6:13
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let f = File::open(format!("{}{}", path, filename)).unwrap();
[INFO] [stderr]   |             ^^^^ use of undeclared type or module `File`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `BufReader`
[INFO] [stderr]  --> src/main.rs:7:18
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let reader = BufReader::new(f);
[INFO] [stderr]   |                  ^^^^^^^^^ use of undeclared type or module `BufReader`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `Regex`
[INFO] [stderr]  --> src/main.rs:8:14
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let re = Regex::new("\t").unwrap();
[INFO] [stderr]   |              ^^^^^ use of undeclared type or module `Regex`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `picross-solver`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "585dd65392a0d238164ef2a3841a21118611e349ccc378c0f4bb1a7be569a4a9"`
[INFO] running `"docker" "rm" "-f" "585dd65392a0d238164ef2a3841a21118611e349ccc378c0f4bb1a7be569a4a9"`
[INFO] [stdout] 585dd65392a0d238164ef2a3841a21118611e349ccc378c0f4bb1a7be569a4a9