Dec 19 09:20:53.441 INFO checking sbwtw/RBTree against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 09:20:53.441 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-1/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/sbwtw/RBTree:/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=forbid" "-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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 09:20:53.908 INFO [stdout] 5cd088c8eb521ac3ce1c037f1bd88be21767d1379feffa90fe77e2befc3e4765
Dec 19 09:20:53.910 INFO running `"docker" "start" "-a" "5cd088c8eb521ac3ce1c037f1bd88be21767d1379feffa90fe77e2befc3e4765"`
Dec 19 09:20:55.416 INFO [stderr]     Checking rbtree v0.1.0 (/opt/crater/workdir)
Dec 19 09:20:55.720 INFO [stderr] warning: variant is never constructed: `Red`
Dec 19 09:20:55.720 INFO [stderr]  --> src/main.rs:7:5
Dec 19 09:20:55.720 INFO [stderr]   |
Dec 19 09:20:55.720 INFO [stderr] 7 |     Red,
Dec 19 09:20:55.720 INFO [stderr]   |     ^^^
Dec 19 09:20:55.720 INFO [stderr]   |
Dec 19 09:20:55.720 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 19 09:20:55.720 INFO [stderr] 
Dec 19 09:20:55.720 INFO [stderr] warning: enum is never used: `Direction`
Dec 19 09:20:55.720 INFO [stderr]   --> src/main.rs:12:1
Dec 19 09:20:55.720 INFO [stderr]    |
Dec 19 09:20:55.720 INFO [stderr] 12 | enum Direction {
Dec 19 09:20:55.720 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 19 09:20:55.720 INFO [stderr] 
Dec 19 09:20:55.720 INFO [stderr] warning: function is never used: `ensure_root_black`
Dec 19 09:20:55.720 INFO [stderr]   --> src/main.rs:79:1
Dec 19 09:20:55.720 INFO [stderr]    |
Dec 19 09:20:55.720 INFO [stderr] 79 | fn ensure_root_black<K: KeyTrait, V: ValueTrait>(root: &mut OptNode<K, V>) {
Dec 19 09:20:55.721 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 09:20:55.721 INFO [stderr] 
Dec 19 09:20:55.721 INFO [stderr] warning: function is never used: `insert_n`
Dec 19 09:20:55.721 INFO [stderr]   --> src/main.rs:85:1
Dec 19 09:20:55.721 INFO [stderr]    |
Dec 19 09:20:55.721 INFO [stderr] 85 | fn insert_n<K: KeyTrait, V: ValueTrait>(root: &mut OptNode<K, V>, key: K, value: V) -> Option<V> {
Dec 19 09:20:55.721 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 09:20:55.721 INFO [stderr] 
Dec 19 09:20:55.721 INFO [stderr] warning: method is never used: `set_color`
Dec 19 09:20:55.721 INFO [stderr]    --> src/main.rs:120:5
Dec 19 09:20:55.721 INFO [stderr]     |
Dec 19 09:20:55.721 INFO [stderr] 120 |     fn set_color(&mut self, color: RBColor) {
Dec 19 09:20:55.721 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 09:20:55.721 INFO [stderr] 
Dec 19 09:20:55.744 INFO [stderr] warning: variant is never constructed: `Red`
Dec 19 09:20:55.744 INFO [stderr]  --> src/main.rs:7:5
Dec 19 09:20:55.744 INFO [stderr]   |
Dec 19 09:20:55.744 INFO [stderr] 7 |     Red,
Dec 19 09:20:55.744 INFO [stderr]   |     ^^^
Dec 19 09:20:55.744 INFO [stderr]   |
Dec 19 09:20:55.744 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 19 09:20:55.744 INFO [stderr] 
Dec 19 09:20:55.744 INFO [stderr] warning: enum is never used: `Direction`
Dec 19 09:20:55.744 INFO [stderr]   --> src/main.rs:12:1
Dec 19 09:20:55.744 INFO [stderr]    |
Dec 19 09:20:55.744 INFO [stderr] 12 | enum Direction {
Dec 19 09:20:55.744 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 19 09:20:55.744 INFO [stderr] 
Dec 19 09:20:55.744 INFO [stderr] warning: function is never used: `ensure_root_black`
Dec 19 09:20:55.744 INFO [stderr]   --> src/main.rs:79:1
Dec 19 09:20:55.744 INFO [stderr]    |
Dec 19 09:20:55.745 INFO [stderr] 79 | fn ensure_root_black<K: KeyTrait, V: ValueTrait>(root: &mut OptNode<K, V>) {
Dec 19 09:20:55.745 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 09:20:55.745 INFO [stderr] 
Dec 19 09:20:55.745 INFO [stderr] warning: function is never used: `insert_n`
Dec 19 09:20:55.745 INFO [stderr]   --> src/main.rs:85:1
Dec 19 09:20:55.745 INFO [stderr]    |
Dec 19 09:20:55.745 INFO [stderr] 85 | fn insert_n<K: KeyTrait, V: ValueTrait>(root: &mut OptNode<K, V>, key: K, value: V) -> Option<V> {
Dec 19 09:20:55.745 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 09:20:55.745 INFO [stderr] 
Dec 19 09:20:55.745 INFO [stderr] warning: method is never used: `set_color`
Dec 19 09:20:55.745 INFO [stderr]    --> src/main.rs:120:5
Dec 19 09:20:55.745 INFO [stderr]     |
Dec 19 09:20:55.745 INFO [stderr] 120 |     fn set_color(&mut self, color: RBColor) {
Dec 19 09:20:55.745 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 09:20:55.745 INFO [stderr] 
Dec 19 09:20:55.804 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.42s
Dec 19 09:20:56.952 INFO running `"docker" "inspect" "5cd088c8eb521ac3ce1c037f1bd88be21767d1379feffa90fe77e2befc3e4765"`
Dec 19 09:20:57.266 INFO running `"docker" "rm" "-f" "5cd088c8eb521ac3ce1c037f1bd88be21767d1379feffa90fe77e2befc3e4765"`
Dec 19 09:20:57.724 INFO [stdout] 5cd088c8eb521ac3ce1c037f1bd88be21767d1379feffa90fe77e2befc3e4765