[INFO] updating cached repository bruce/rust-mazes
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/bruce/rust-mazes
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/bruce/rust-mazes" "work/ex/beta-1.37-6/sources/1.36.0/gh/bruce/rust-mazes"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/bruce/rust-mazes'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/bruce/rust-mazes" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bruce/rust-mazes"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bruce/rust-mazes'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 678739609b4cc22ca4c08e98f2c38976f34c77cf
[INFO] sha for GitHub repo bruce/rust-mazes: 678739609b4cc22ca4c08e98f2c38976f34c77cf
[INFO] validating manifest of bruce/rust-mazes on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of bruce/rust-mazes on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing bruce/rust-mazes
[INFO] finished frobbing bruce/rust-mazes
[INFO] frobbed toml for bruce/rust-mazes written to work/ex/beta-1.37-6/sources/1.36.0/gh/bruce/rust-mazes/Cargo.toml
[INFO] started frobbing bruce/rust-mazes
[INFO] finished frobbing bruce/rust-mazes
[INFO] frobbed toml for bruce/rust-mazes written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/bruce/rust-mazes/Cargo.toml
[INFO] crate bruce/rust-mazes already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing bruce/rust-mazes against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/bruce/rust-mazes:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] b2cc12b618f32ef9810e712199079122d43954adf189bc4d2369c34ce6eb1a86
[INFO] running `"docker" "start" "-a" "b2cc12b618f32ef9810e712199079122d43954adf189bc4d2369c34ce6eb1a86"`
[INFO] [stderr]    Compiling mazes v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> src/grid.rs:22:20
[INFO] [stderr]    |
[INFO] [stderr] 22 |         for col in (1..cols) {
[INFO] [stderr]    |                    ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> src/grid.rs:24:24
[INFO] [stderr]    |
[INFO] [stderr] 24 |             for row in (1..rows) {
[INFO] [stderr]    |                        ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.39s
[INFO] running `"docker" "inspect" "b2cc12b618f32ef9810e712199079122d43954adf189bc4d2369c34ce6eb1a86"`
[INFO] running `"docker" "rm" "-f" "b2cc12b618f32ef9810e712199079122d43954adf189bc4d2369c34ce6eb1a86"`
[INFO] [stdout] b2cc12b618f32ef9810e712199079122d43954adf189bc4d2369c34ce6eb1a86
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/bruce/rust-mazes:/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 040da751d85d42610274405b6b48f2b1268c67ae749a092a75f7cf106f0a08f9
[INFO] running `"docker" "start" "-a" "040da751d85d42610274405b6b48f2b1268c67ae749a092a75f7cf106f0a08f9"`
[INFO] [stderr]    Compiling mazes v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> src/grid.rs:22:20
[INFO] [stderr]    |
[INFO] [stderr] 22 |         for col in (1..cols) {
[INFO] [stderr]    |                    ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> src/grid.rs:24:24
[INFO] [stderr]    |
[INFO] [stderr] 24 |             for row in (1..rows) {
[INFO] [stderr]    |                        ^^^^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.73s
[INFO] running `"docker" "inspect" "040da751d85d42610274405b6b48f2b1268c67ae749a092a75f7cf106f0a08f9"`
[INFO] running `"docker" "rm" "-f" "040da751d85d42610274405b6b48f2b1268c67ae749a092a75f7cf106f0a08f9"`
[INFO] [stdout] 040da751d85d42610274405b6b48f2b1268c67ae749a092a75f7cf106f0a08f9
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-4/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/bruce/rust-mazes:/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 63a49559c57ba67911d6dacf879901d4353973b9baf748889c3c9c0cc08f864c
[INFO] running `"docker" "start" "-a" "63a49559c57ba67911d6dacf879901d4353973b9baf748889c3c9c0cc08f864c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mazes-f03ebda4288f4b68
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test test::grid_new ... ok
[INFO] [stdout] test test::grid_cell ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mazes-c63989b1d9df62c1
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests mazes
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "63a49559c57ba67911d6dacf879901d4353973b9baf748889c3c9c0cc08f864c"`
[INFO] running `"docker" "rm" "-f" "63a49559c57ba67911d6dacf879901d4353973b9baf748889c3c9c0cc08f864c"`
[INFO] [stdout] 63a49559c57ba67911d6dacf879901d4353973b9baf748889c3c9c0cc08f864c