Dec 12 06:34:40.540 INFO checking tap-0.3.0 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 06:34:40.540 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-2/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/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 +3a75e80557a103497cffbcab395a2f37061a77ea-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"`
Dec 12 06:34:40.885 INFO [stdout] 08f8e486f20b47f00df22dbb45282e94982bb3ceacd93d2320dade3f2ab9f1a8
Dec 12 06:34:40.887 INFO running `"docker" "start" "-a" "08f8e486f20b47f00df22dbb45282e94982bb3ceacd93d2320dade3f2ab9f1a8"`
Dec 12 06:34:42.101 INFO [stderr] usermod: no changes
Dec 12 06:34:42.150 INFO [stderr]     Checking tap v0.3.0 (/source)
Dec 12 06:34:42.579 INFO [stderr] warning: variable does not need to be mutable
Dec 12 06:34:42.579 INFO [stderr]   --> src/lib.rs:78:21
Dec 12 06:34:42.579 INFO [stderr]    |
Dec 12 06:34:42.579 INFO [stderr] 78 |         if let Some(mut val) = self.as_mut() {
Dec 12 06:34:42.579 INFO [stderr]    |                     ----^^^
Dec 12 06:34:42.579 INFO [stderr]    |                     |
Dec 12 06:34:42.579 INFO [stderr]    |                     help: remove this `mut`
Dec 12 06:34:42.579 INFO [stderr]    |
Dec 12 06:34:42.579 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 06:34:42.579 INFO [stderr] 
Dec 12 06:34:42.647 INFO [stderr] warning: unused `#[macro_use]` import
Dec 12 06:34:42.647 INFO [stderr]   --> src/lib.rs:14:18
Dec 12 06:34:42.647 INFO [stderr]    |
Dec 12 06:34:42.647 INFO [stderr] 14 | #[cfg_attr(test, macro_use)]
Dec 12 06:34:42.647 INFO [stderr]    |                  ^^^^^^^^^
Dec 12 06:34:42.647 INFO [stderr]    |
Dec 12 06:34:42.647 INFO [stderr]    = note: #[warn(unused_imports)] on by default
Dec 12 06:34:42.647 INFO [stderr] 
Dec 12 06:34:42.728 INFO [stderr] warning: variable does not need to be mutable
Dec 12 06:34:42.728 INFO [stderr]   --> src/lib.rs:78:21
Dec 12 06:34:42.728 INFO [stderr]    |
Dec 12 06:34:42.728 INFO [stderr] 78 |         if let Some(mut val) = self.as_mut() {
Dec 12 06:34:42.728 INFO [stderr]    |                     ----^^^
Dec 12 06:34:42.728 INFO [stderr]    |                     |
Dec 12 06:34:42.728 INFO [stderr]    |                     help: remove this `mut`
Dec 12 06:34:42.728 INFO [stderr]    |
Dec 12 06:34:42.728 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 06:34:42.728 INFO [stderr] 
Dec 12 06:34:42.763 INFO [stderr] warning: variable does not need to be mutable
Dec 12 06:34:42.763 INFO [stderr]    --> src/lib.rs:141:33
Dec 12 06:34:42.763 INFO [stderr]     |
Dec 12 06:34:42.763 INFO [stderr] 141 |         let mutated = base.tap(|mut arr| for elt in arr.iter_mut() {
Dec 12 06:34:42.763 INFO [stderr]     |                                 ----^^^
Dec 12 06:34:42.763 INFO [stderr]     |                                 |
Dec 12 06:34:42.763 INFO [stderr]     |                                 help: remove this `mut`
Dec 12 06:34:42.764 INFO [stderr] 
Dec 12 06:34:43.110 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.99s
Dec 12 06:34:43.111 INFO [stderr] su: No module specific data is present
Dec 12 06:34:43.378 INFO running `"docker" "inspect" "08f8e486f20b47f00df22dbb45282e94982bb3ceacd93d2320dade3f2ab9f1a8"`
Dec 12 06:34:43.482 INFO running `"docker" "rm" "-f" "08f8e486f20b47f00df22dbb45282e94982bb3ceacd93d2320dade3f2ab9f1a8"`
Dec 12 06:34:43.576 INFO [stdout] 08f8e486f20b47f00df22dbb45282e94982bb3ceacd93d2320dade3f2ab9f1a8