Nov 28 07:31:25.964 INFO checking conundrumer/crossword against master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5 for pr-56074
Nov 28 07:31:25.965 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56074/worker-6/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56074/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/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 +0b9f19dff1347e29bf4362ab5a8fab84b43023b5-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 28 07:31:26.350 INFO [stdout] f2aefabfd443432ae9ed8f195de4c05cff82287f23c107552f1da67bac6ab60f
Nov 28 07:31:26.352 INFO running `"docker" "start" "-a" "f2aefabfd443432ae9ed8f195de4c05cff82287f23c107552f1da67bac6ab60f"`
Nov 28 07:31:27.683 INFO [stderr] usermod: no changes
Nov 28 07:31:27.740 INFO [stderr]     Checking crossword v0.1.0 (/source)
Nov 28 07:31:28.241 INFO [stderr] warning: unnecessary parentheses around function argument
Nov 28 07:31:28.241 INFO [stderr]   --> src/grid.rs:25:21
Nov 28 07:31:28.241 INFO [stderr]    |
Nov 28 07:31:28.241 INFO [stderr] 25 |         vec![Empty; ((bb.width() as usize) * (bb.height() as usize))]
Nov 28 07:31:28.241 INFO [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
Nov 28 07:31:28.241 INFO [stderr]    |
Nov 28 07:31:28.242 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Nov 28 07:31:28.242 INFO [stderr] 
Nov 28 07:31:28.408 INFO [stderr] warning: unnecessary parentheses around function argument
Nov 28 07:31:28.409 INFO [stderr]   --> src/grid.rs:25:21
Nov 28 07:31:28.409 INFO [stderr]    |
Nov 28 07:31:28.409 INFO [stderr] 25 |         vec![Empty; ((bb.width() as usize) * (bb.height() as usize))]
Nov 28 07:31:28.410 INFO [stderr]    |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
Nov 28 07:31:28.410 INFO [stderr]    |
Nov 28 07:31:28.410 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Nov 28 07:31:28.410 INFO [stderr] 
Nov 28 07:31:28.688 INFO [stderr] warning: variable does not need to be mutable
Nov 28 07:31:28.689 INFO [stderr]    --> src/filter.rs:115:17
Nov 28 07:31:28.689 INFO [stderr]     |
Nov 28 07:31:28.689 INFO [stderr] 115 |             let mut seen = &mut self.seen.borrow_mut();
Nov 28 07:31:28.689 INFO [stderr]     |                 ----^^^^
Nov 28 07:31:28.689 INFO [stderr]     |                 |
Nov 28 07:31:28.689 INFO [stderr]     |                 help: remove this `mut`
Nov 28 07:31:28.690 INFO [stderr]     |
Nov 28 07:31:28.690 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Nov 28 07:31:28.690 INFO [stderr] 
Nov 28 07:31:28.788 INFO [stderr] warning: type alias is never used: `GridCellPos`
Nov 28 07:31:28.788 INFO [stderr]  --> src/grid_cell.rs:4:1
Nov 28 07:31:28.788 INFO [stderr]   |
Nov 28 07:31:28.788 INFO [stderr] 4 | type GridCellPos = (GridCell, (i8, i8));
Nov 28 07:31:28.788 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 07:31:28.788 INFO [stderr]   |
Nov 28 07:31:28.788 INFO [stderr]   = note: #[warn(dead_code)] on by default
Nov 28 07:31:28.788 INFO [stderr] 
Nov 28 07:31:28.788 INFO [stderr] warning: method is never used: `is_valid`
Nov 28 07:31:28.789 INFO [stderr]   --> src/crossword.rs:38:5
Nov 28 07:31:28.789 INFO [stderr]    |
Nov 28 07:31:28.789 INFO [stderr] 38 |     pub fn is_valid(&self) -> bool {
Nov 28 07:31:28.789 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 07:31:28.789 INFO [stderr] 
Nov 28 07:31:28.789 INFO [stderr] warning: method is never used: `iter`
Nov 28 07:31:28.789 INFO [stderr]   --> src/generate.rs:41:5
Nov 28 07:31:28.789 INFO [stderr]    |
Nov 28 07:31:28.789 INFO [stderr] 41 |     pub fn iter<'b>(&'b self) -> Box<Iterator<Item=Crossword> + 'b> {
Nov 28 07:31:28.789 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 07:31:28.789 INFO [stderr] 
Nov 28 07:31:28.789 INFO [stderr] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
Nov 28 07:31:28.789 INFO [stderr]  --> src/main.rs:1:12
Nov 28 07:31:28.789 INFO [stderr]   |
Nov 28 07:31:28.789 INFO [stderr] 1 | #![feature(conservative_impl_trait)]
Nov 28 07:31:28.789 INFO [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 07:31:28.789 INFO [stderr]   |
Nov 28 07:31:28.789 INFO [stderr]   = note: #[warn(stable_features)] on by default
Nov 28 07:31:28.789 INFO [stderr] 
Nov 28 07:31:28.999 INFO [stderr] warning: variable does not need to be mutable
Nov 28 07:31:28.999 INFO [stderr]    --> src/filter.rs:115:17
Nov 28 07:31:28.999 INFO [stderr]     |
Nov 28 07:31:28.999 INFO [stderr] 115 |             let mut seen = &mut self.seen.borrow_mut();
Nov 28 07:31:28.999 INFO [stderr]     |                 ----^^^^
Nov 28 07:31:28.999 INFO [stderr]     |                 |
Nov 28 07:31:28.999 INFO [stderr]     |                 help: remove this `mut`
Nov 28 07:31:28.999 INFO [stderr]     |
Nov 28 07:31:28.999 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Nov 28 07:31:28.999 INFO [stderr] 
Nov 28 07:31:29.072 INFO [stderr] warning: type alias is never used: `GridCellPos`
Nov 28 07:31:29.073 INFO [stderr]  --> src/grid_cell.rs:4:1
Nov 28 07:31:29.073 INFO [stderr]   |
Nov 28 07:31:29.073 INFO [stderr] 4 | type GridCellPos = (GridCell, (i8, i8));
Nov 28 07:31:29.074 INFO [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 07:31:29.074 INFO [stderr]   |
Nov 28 07:31:29.074 INFO [stderr]   = note: #[warn(dead_code)] on by default
Nov 28 07:31:29.074 INFO [stderr] 
Nov 28 07:31:29.075 INFO [stderr] warning: type alias is never used: `WordPosition`
Nov 28 07:31:29.075 INFO [stderr]    --> src/generate.rs:185:5
Nov 28 07:31:29.075 INFO [stderr]     |
Nov 28 07:31:29.075 INFO [stderr] 185 |     type WordPosition = (&'static str, Position);
Nov 28 07:31:29.076 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 07:31:29.076 INFO [stderr] 
Nov 28 07:31:29.076 INFO [stderr] warning: the feature `conservative_impl_trait` has been stable since 1.26.0 and no longer requires an attribute to enable
Nov 28 07:31:29.076 INFO [stderr]  --> src/main.rs:1:12
Nov 28 07:31:29.077 INFO [stderr]   |
Nov 28 07:31:29.077 INFO [stderr] 1 | #![feature(conservative_impl_trait)]
Nov 28 07:31:29.077 INFO [stderr]   |            ^^^^^^^^^^^^^^^^^^^^^^^
Nov 28 07:31:29.077 INFO [stderr]   |
Nov 28 07:31:29.078 INFO [stderr]   = note: #[warn(stable_features)] on by default
Nov 28 07:31:29.078 INFO [stderr] 
Nov 28 07:31:29.106 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.40s
Nov 28 07:31:29.109 INFO [stderr] su: No module specific data is present
Nov 28 07:31:29.650 INFO running `"docker" "inspect" "f2aefabfd443432ae9ed8f195de4c05cff82287f23c107552f1da67bac6ab60f"`
Nov 28 07:31:30.032 INFO running `"docker" "rm" "-f" "f2aefabfd443432ae9ed8f195de4c05cff82287f23c107552f1da67bac6ab60f"`
Nov 28 07:31:30.294 INFO [stdout] f2aefabfd443432ae9ed8f195de4c05cff82287f23c107552f1da67bac6ab60f