[INFO] updating cached repository lotabout/skim
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/lotabout/skim
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/lotabout/skim" "work/ex/pr-60174/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/lotabout/skim"`
[INFO] [stderr] Cloning into 'work/ex/pr-60174/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/lotabout/skim'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/lotabout/skim" "work/ex/pr-60174/sources/try#74092351c05ae61047b2be02024415546595e974/gh/lotabout/skim"`
[INFO] [stderr] Cloning into 'work/ex/pr-60174/sources/try#74092351c05ae61047b2be02024415546595e974/gh/lotabout/skim'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 53503187f90de785419ee78d5b7dd1796d58c298
[INFO] sha for GitHub repo lotabout/skim: 53503187f90de785419ee78d5b7dd1796d58c298
[INFO] validating manifest of lotabout/skim on toolchain master#e305df1846a6d985315917ae0c81b74af8b4e641
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of lotabout/skim on toolchain try#74092351c05ae61047b2be02024415546595e974
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+74092351c05ae61047b2be02024415546595e974-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing lotabout/skim
[INFO] finished frobbing lotabout/skim
[INFO] frobbed toml for lotabout/skim written to work/ex/pr-60174/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/lotabout/skim/Cargo.toml
[INFO] started frobbing lotabout/skim
[INFO] finished frobbing lotabout/skim
[INFO] frobbed toml for lotabout/skim written to work/ex/pr-60174/sources/try#74092351c05ae61047b2be02024415546595e974/gh/lotabout/skim/Cargo.toml
[INFO] crate lotabout/skim already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+74092351c05ae61047b2be02024415546595e974-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking lotabout/skim against master#e305df1846a6d985315917ae0c81b74af8b4e641 for pr-60174
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60174/worker-7/master#e305df1846a6d985315917ae0c81b74af8b4e641:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60174/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/lotabout/skim:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 28dbf3a18066a5ecf826128211fee80065d5b6ef4f0cb6759c0fcf1436257eb5
[INFO] running `"docker" "start" "-a" "28dbf3a18066a5ecf826128211fee80065d5b6ef4f0cb6759c0fcf1436257eb5"`
[INFO] [stderr]     Checking shlex v0.1.1
[INFO] [stderr]     Checking fuzzy-matcher v0.2.0
[INFO] [stderr]     Checking nix v0.11.0
[INFO] [stderr]     Checking env_logger v0.4.3
[INFO] [stderr]     Checking skiplist v0.2.10
[INFO] [stderr]     Checking tuikit v0.1.5
[INFO] [stderr]     Checking skim v0.5.5 (/opt/crater/workdir)
[INFO] [stderr] warning: struct is never constructed: `CasMutex`
[INFO] [stderr]   --> src/casmutex.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | pub struct CasMutex<T: ?Sized> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `CasMutexGuard`
[INFO] [stderr]   --> src/casmutex.rs:22:1
[INFO] [stderr]    |
[INFO] [stderr] 22 | pub struct CasMutexGuard<'a, T: ?Sized + 'a> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/casmutex.rs:29:5
[INFO] [stderr]    |
[INFO] [stderr] 29 |     pub fn new(pool: &'a CasMutex<T>) -> CasMutexGuard<'a, T>{
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/casmutex.rs:37:5
[INFO] [stderr]    |
[INFO] [stderr] 37 |     pub fn new(t: T) -> CasMutex<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `lock`
[INFO] [stderr]   --> src/casmutex.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn lock(&self) -> CasMutexGuard<T> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.75s
[INFO] running `"docker" "inspect" "28dbf3a18066a5ecf826128211fee80065d5b6ef4f0cb6759c0fcf1436257eb5"`
[INFO] running `"docker" "rm" "-f" "28dbf3a18066a5ecf826128211fee80065d5b6ef4f0cb6759c0fcf1436257eb5"`
[INFO] [stdout] 28dbf3a18066a5ecf826128211fee80065d5b6ef4f0cb6759c0fcf1436257eb5