Dec 18 10:32:12.041 INFO checking tap-0.3.0 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 10:32:12.042 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-3/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/tap/0.3.0:/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 18 10:32:12.552 INFO [stdout] 9d1592acd68fb29630137f2a123872e0fd0c3d91a2f123cd21d62bc8c5b7ff16
Dec 18 10:32:12.554 INFO running `"docker" "start" "-a" "9d1592acd68fb29630137f2a123872e0fd0c3d91a2f123cd21d62bc8c5b7ff16"`
Dec 18 10:32:13.745 INFO [stderr]     Checking tap v0.3.0 (/opt/crater/workdir)
Dec 18 10:32:14.115 INFO [stderr] warning: variable does not need to be mutable
Dec 18 10:32:14.115 INFO [stderr]   --> src/lib.rs:78:21
Dec 18 10:32:14.115 INFO [stderr]    |
Dec 18 10:32:14.115 INFO [stderr] 78 |         if let Some(mut val) = self.as_mut() {
Dec 18 10:32:14.115 INFO [stderr]    |                     ----^^^
Dec 18 10:32:14.115 INFO [stderr]    |                     |
Dec 18 10:32:14.115 INFO [stderr]    |                     help: remove this `mut`
Dec 18 10:32:14.115 INFO [stderr]    |
Dec 18 10:32:14.115 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 10:32:14.115 INFO [stderr] 
Dec 18 10:32:14.194 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 10:32:14.194 INFO [stderr]   --> src/lib.rs:14:18
Dec 18 10:32:14.194 INFO [stderr]    |
Dec 18 10:32:14.194 INFO [stderr] 14 | #[cfg_attr(test, macro_use)]
Dec 18 10:32:14.204 INFO [stderr]    |                  ^^^^^^^^^
Dec 18 10:32:14.204 INFO [stderr]    |
Dec 18 10:32:14.204 INFO [stderr]    = note: #[warn(unused_imports)] on by default
Dec 18 10:32:14.204 INFO [stderr] 
Dec 18 10:32:14.381 INFO [stderr] warning: variable does not need to be mutable
Dec 18 10:32:14.382 INFO [stderr]   --> src/lib.rs:78:21
Dec 18 10:32:14.382 INFO [stderr]    |
Dec 18 10:32:14.382 INFO [stderr] 78 |         if let Some(mut val) = self.as_mut() {
Dec 18 10:32:14.382 INFO [stderr]    |                     ----^^^
Dec 18 10:32:14.382 INFO [stderr]    |                     |
Dec 18 10:32:14.384 INFO [stderr]    |                     help: remove this `mut`
Dec 18 10:32:14.392 INFO [stderr]    |
Dec 18 10:32:14.392 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 10:32:14.392 INFO [stderr] 
Dec 18 10:32:14.428 INFO [stderr] warning: variable does not need to be mutable
Dec 18 10:32:14.428 INFO [stderr]    --> src/lib.rs:141:33
Dec 18 10:32:14.428 INFO [stderr]     |
Dec 18 10:32:14.428 INFO [stderr] 141 |         let mutated = base.tap(|mut arr| for elt in arr.iter_mut() {
Dec 18 10:32:14.428 INFO [stderr]     |                                 ----^^^
Dec 18 10:32:14.428 INFO [stderr]     |                                 |
Dec 18 10:32:14.428 INFO [stderr]     |                                 help: remove this `mut`
Dec 18 10:32:14.428 INFO [stderr] 
Dec 18 10:32:14.569 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.85s
Dec 18 10:32:15.159 INFO running `"docker" "inspect" "9d1592acd68fb29630137f2a123872e0fd0c3d91a2f123cd21d62bc8c5b7ff16"`
Dec 18 10:32:15.460 INFO running `"docker" "rm" "-f" "9d1592acd68fb29630137f2a123872e0fd0c3d91a2f123cd21d62bc8c5b7ff16"`
Dec 18 10:32:15.703 INFO [stdout] 9d1592acd68fb29630137f2a123872e0fd0c3d91a2f123cd21d62bc8c5b7ff16