Dec 17 16:03:11.123 INFO checking sbwtw/RBTree against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 17 16:03:11.123 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-5/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 16:03:11.550 INFO [stdout] 68aad953de717d391a11117cd1a5019bea2cd4f622475db4fcb83b6ce151adfc
Dec 17 16:03:11.550 INFO running `"docker" "start" "-a" "68aad953de717d391a11117cd1a5019bea2cd4f622475db4fcb83b6ce151adfc"`
Dec 17 16:03:12.688 INFO [stderr]     Checking rbtree v0.1.0 (/opt/crater/workdir)
Dec 17 16:03:12.920 INFO [stderr] warning: variant is never constructed: `Red`
Dec 17 16:03:12.920 INFO [stderr]  --> src/main.rs:7:5
Dec 17 16:03:12.920 INFO [stderr]   |
Dec 17 16:03:12.920 INFO [stderr] 7 |     Red,
Dec 17 16:03:12.920 INFO [stderr]   |     ^^^
Dec 17 16:03:12.920 INFO [stderr]   |
Dec 17 16:03:12.920 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 17 16:03:12.920 INFO [stderr] 
Dec 17 16:03:12.920 INFO [stderr] warning: enum is never used: `Direction`
Dec 17 16:03:12.920 INFO [stderr]   --> src/main.rs:12:1
Dec 17 16:03:12.920 INFO [stderr]    |
Dec 17 16:03:12.920 INFO [stderr] 12 | enum Direction {
Dec 17 16:03:12.920 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 17 16:03:12.920 INFO [stderr] 
Dec 17 16:03:12.923 INFO [stderr] warning: function is never used: `ensure_root_black`
Dec 17 16:03:12.923 INFO [stderr]   --> src/main.rs:79:1
Dec 17 16:03:12.923 INFO [stderr]    |
Dec 17 16:03:12.923 INFO [stderr] 79 | fn ensure_root_black<K: KeyTrait, V: ValueTrait>(root: &mut OptNode<K, V>) {
Dec 17 16:03:12.923 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 16:03:12.923 INFO [stderr] 
Dec 17 16:03:12.923 INFO [stderr] warning: function is never used: `insert_n`
Dec 17 16:03:12.923 INFO [stderr]   --> src/main.rs:85:1
Dec 17 16:03:12.923 INFO [stderr]    |
Dec 17 16:03:12.923 INFO [stderr] 85 | fn insert_n<K: KeyTrait, V: ValueTrait>(root: &mut OptNode<K, V>, key: K, value: V) -> Option<V> {
Dec 17 16:03:12.923 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 16:03:12.923 INFO [stderr] 
Dec 17 16:03:12.923 INFO [stderr] warning: method is never used: `set_color`
Dec 17 16:03:12.923 INFO [stderr]    --> src/main.rs:120:5
Dec 17 16:03:12.924 INFO [stderr]     |
Dec 17 16:03:12.924 INFO [stderr] 120 |     fn set_color(&mut self, color: RBColor) {
Dec 17 16:03:12.924 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 16:03:12.924 INFO [stderr] 
Dec 17 16:03:12.932 INFO [stderr] warning: variant is never constructed: `Red`
Dec 17 16:03:12.932 INFO [stderr]  --> src/main.rs:7:5
Dec 17 16:03:12.932 INFO [stderr]   |
Dec 17 16:03:12.932 INFO [stderr] 7 |     Red,
Dec 17 16:03:12.932 INFO [stderr]   |     ^^^
Dec 17 16:03:12.932 INFO [stderr]   |
Dec 17 16:03:12.932 INFO [stderr]   = note: #[warn(dead_code)] on by default
Dec 17 16:03:12.932 INFO [stderr] 
Dec 17 16:03:12.932 INFO [stderr] warning: enum is never used: `Direction`
Dec 17 16:03:12.932 INFO [stderr]   --> src/main.rs:12:1
Dec 17 16:03:12.932 INFO [stderr]    |
Dec 17 16:03:12.932 INFO [stderr] 12 | enum Direction {
Dec 17 16:03:12.932 INFO [stderr]    | ^^^^^^^^^^^^^^
Dec 17 16:03:12.932 INFO [stderr] 
Dec 17 16:03:12.932 INFO [stderr] warning: function is never used: `ensure_root_black`
Dec 17 16:03:12.932 INFO [stderr]   --> src/main.rs:79:1
Dec 17 16:03:12.932 INFO [stderr]    |
Dec 17 16:03:12.932 INFO [stderr] 79 | fn ensure_root_black<K: KeyTrait, V: ValueTrait>(root: &mut OptNode<K, V>) {
Dec 17 16:03:12.933 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 16:03:12.933 INFO [stderr] 
Dec 17 16:03:12.933 INFO [stderr] warning: function is never used: `insert_n`
Dec 17 16:03:12.933 INFO [stderr]   --> src/main.rs:85:1
Dec 17 16:03:12.933 INFO [stderr]    |
Dec 17 16:03:12.933 INFO [stderr] 85 | fn insert_n<K: KeyTrait, V: ValueTrait>(root: &mut OptNode<K, V>, key: K, value: V) -> Option<V> {
Dec 17 16:03:12.933 INFO [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 16:03:12.933 INFO [stderr] 
Dec 17 16:03:12.933 INFO [stderr] warning: method is never used: `set_color`
Dec 17 16:03:12.933 INFO [stderr]    --> src/main.rs:120:5
Dec 17 16:03:12.933 INFO [stderr]     |
Dec 17 16:03:12.933 INFO [stderr] 120 |     fn set_color(&mut self, color: RBColor) {
Dec 17 16:03:12.933 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 16:03:12.933 INFO [stderr] 
Dec 17 16:03:12.977 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.30s
Dec 17 16:03:13.490 INFO running `"docker" "inspect" "68aad953de717d391a11117cd1a5019bea2cd4f622475db4fcb83b6ce151adfc"`
Dec 17 16:03:13.680 INFO running `"docker" "rm" "-f" "68aad953de717d391a11117cd1a5019bea2cd4f622475db4fcb83b6ce151adfc"`
Dec 17 16:03:13.884 INFO [stdout] 68aad953de717d391a11117cd1a5019bea2cd4f622475db4fcb83b6ce151adfc