[INFO] crate slice-deque 0.1.16 is already in cache
[INFO] extracting crate slice-deque 0.1.16 into work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/reg/slice-deque/0.1.16
[INFO] extracting crate slice-deque 0.1.16 into work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/reg/slice-deque/0.1.16
[INFO] validating manifest of slice-deque-0.1.16 on toolchain master#39401465da4ce27aeeb2c2a26133ac35c63aa515
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of slice-deque-0.1.16 on toolchain try#f45cc3094ee337acd688771b9234318046b0572d
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing slice-deque-0.1.16
[INFO] finished frobbing slice-deque-0.1.16
[INFO] frobbed toml for slice-deque-0.1.16 written to work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/reg/slice-deque/0.1.16/Cargo.toml
[INFO] started frobbing slice-deque-0.1.16
[INFO] finished frobbing slice-deque-0.1.16
[INFO] frobbed toml for slice-deque-0.1.16 written to work/ex/pr-60914/sources/try#f45cc3094ee337acd688771b9234318046b0572d/reg/slice-deque/0.1.16/Cargo.toml
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+f45cc3094ee337acd688771b9234318046b0572d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking slice-deque-0.1.16 against master#39401465da4ce27aeeb2c2a26133ac35c63aa515 for pr-60914
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60914/worker-6/master#39401465da4ce27aeeb2c2a26133ac35c63aa515:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60914/sources/master#39401465da4ce27aeeb2c2a26133ac35c63aa515/reg/slice-deque/0.1.16:/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" "+39401465da4ce27aeeb2c2a26133ac35c63aa515-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] da3b949319958358bb3a1b86c6e83fa40001eec473a9a80bb353a0e17ab94ef5
[INFO] running `"docker" "start" "-a" "da3b949319958358bb3a1b86c6e83fa40001eec473a9a80bb353a0e17ab94ef5"`
[INFO] [stderr]    Compiling libc v0.2.55
[INFO] [stderr]     Checking slice-deque v0.1.16 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/macros.rs:23:25
[INFO] [stderr]    |
[INFO] [stderr] 23 |             if let Some(mut v) = self.buf.get_mut(idx) {
[INFO] [stderr]    |                         ----^
[INFO] [stderr]    |                         |
[INFO] [stderr]    |                         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/lib.rs:3370:17
[INFO] [stderr]      |
[INFO] [stderr] 3370 |             let mut counter = Rc::new(RefCell::new(0));
[INFO] [stderr]      |                 ----^^^^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr]      |
[INFO] [stderr]      = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]     --> src/lib.rs:3384:17
[INFO] [stderr]      |
[INFO] [stderr] 3384 |             let mut counter = Rc::new(RefCell::new(0));
[INFO] [stderr]      |                 ----^^^^^^^
[INFO] [stderr]      |                 |
[INFO] [stderr]      |                 help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/macros.rs:23:25
[INFO] [stderr]    |
[INFO] [stderr] 23 |             if let Some(mut v) = self.buf.get_mut(idx) {
[INFO] [stderr]    |                         ----^
[INFO] [stderr]    |                         |
[INFO] [stderr]    |                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.68s
[INFO] running `"docker" "inspect" "da3b949319958358bb3a1b86c6e83fa40001eec473a9a80bb353a0e17ab94ef5"`
[INFO] running `"docker" "rm" "-f" "da3b949319958358bb3a1b86c6e83fa40001eec473a9a80bb353a0e17ab94ef5"`
[INFO] [stdout] da3b949319958358bb3a1b86c6e83fa40001eec473a9a80bb353a0e17ab94ef5