[INFO] updating cached repository https://github.com/hayatoito/icfp2006
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/mnt/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] d2761d0704b84f5c2096bae37be5d0bef3641251
[INFO] checking hayatoito/icfp2006 against master#c9edc02e8320a9e5799d185910ece7d491f524e6 for pr-64398
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fhayatoito%2Ficfp2006" "work/builds/worker-1/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/hayatoito/icfp2006 on toolchain c9edc02e8320a9e5799d185910ece7d491f524e6-alt
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/hayatoito/icfp2006
[INFO] finished tweaking git repo https://github.com/hayatoito/icfp2006
[INFO] tweaked toml for git repo https://github.com/hayatoito/icfp2006 written to work/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/hayatoito/icfp2006 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/cargo-home/bin/cargo" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/mnt/big/crater/work/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/mnt/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/mnt/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=forbid" "-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" "+c9edc02e8320a9e5799d185910ece7d491f524e6-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 04026bec4fbdd140ca048db399573e54b442ce709740a683920c326296e8b641
[INFO] running `"docker" "start" "-a" "04026bec4fbdd140ca048db399573e54b442ce709740a683920c326296e8b641"`
[INFO] [stderr]     Checking loggerv v0.4.0
[INFO] [stderr]    Compiling structopt-derive v0.1.1
[INFO] [stderr]     Checking structopt v0.1.1
[INFO] [stderr]     Checking icfp2006 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: struct is never constructed: `InteractiveUm`
[INFO] [stderr]    --> src/um.rs:242:1
[INFO] [stderr]     |
[INFO] [stderr] 242 | struct InteractiveUm<R, W> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `repl`
[INFO] [stderr]    --> src/um.rs:251:5
[INFO] [stderr]     |
[INFO] [stderr] 251 |     pub fn repl(&mut self, line: R) -> Option<&W> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `InteractiveUm`
[INFO] [stderr]    --> src/um.rs:242:1
[INFO] [stderr]     |
[INFO] [stderr] 242 | struct InteractiveUm<R, W> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `repl`
[INFO] [stderr]    --> src/um.rs:251:5
[INFO] [stderr]     |
[INFO] [stderr] 251 |     pub fn repl(&mut self, line: R) -> Option<&W> {
[INFO] [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.83s
[INFO] running `"docker" "inspect" "04026bec4fbdd140ca048db399573e54b442ce709740a683920c326296e8b641"`
[INFO] running `"docker" "rm" "-f" "04026bec4fbdd140ca048db399573e54b442ce709740a683920c326296e8b641"`
[INFO] [stdout] 04026bec4fbdd140ca048db399573e54b442ce709740a683920c326296e8b641