[INFO] updating cached repository ricardopieper/rust-concurrency-tests
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ricardopieper/rust-concurrency-tests
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ricardopieper/rust-concurrency-tests" "work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/ricardopieper/rust-concurrency-tests"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/ricardopieper/rust-concurrency-tests'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ricardopieper/rust-concurrency-tests" "work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/ricardopieper/rust-concurrency-tests"`
[INFO] [stderr] Cloning into 'work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/ricardopieper/rust-concurrency-tests'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] bf5d96403af158bfc1ad58a705530c2211efde87
[INFO] sha for GitHub repo ricardopieper/rust-concurrency-tests: bf5d96403af158bfc1ad58a705530c2211efde87
[INFO] validating manifest of ricardopieper/rust-concurrency-tests on toolchain master#c43d03a19f326f4a323569328cc501e86eb6d22e
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ricardopieper/rust-concurrency-tests on toolchain try#75eff020d0923c035c2fe220db4a0465cd847048
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing ricardopieper/rust-concurrency-tests
[INFO] finished frobbing ricardopieper/rust-concurrency-tests
[INFO] frobbed toml for ricardopieper/rust-concurrency-tests written to work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/ricardopieper/rust-concurrency-tests/Cargo.toml
[INFO] started frobbing ricardopieper/rust-concurrency-tests
[INFO] finished frobbing ricardopieper/rust-concurrency-tests
[INFO] frobbed toml for ricardopieper/rust-concurrency-tests written to work/ex/pr-63565/sources/try#75eff020d0923c035c2fe220db4a0465cd847048/gh/ricardopieper/rust-concurrency-tests/Cargo.toml
[INFO] crate ricardopieper/rust-concurrency-tests already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+75eff020d0923c035c2fe220db4a0465cd847048-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking ricardopieper/rust-concurrency-tests against master#c43d03a19f326f4a323569328cc501e86eb6d22e for pr-63565
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63565/worker-0/master#c43d03a19f326f4a323569328cc501e86eb6d22e:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63565/sources/master#c43d03a19f326f4a323569328cc501e86eb6d22e/gh/ricardopieper/rust-concurrency-tests:/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" "+c43d03a19f326f4a323569328cc501e86eb6d22e-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 79aa295160dbe85766f63297b54e4db86754d04d7b16035ef73ca5765e4f1bf2
[INFO] running `"docker" "start" "-a" "79aa295160dbe85766f63297b54e4db86754d04d7b16035ef73ca5765e4f1bf2"`
[INFO] [stderr]     Checking rust-concurrency-tests v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> tests/linked_set_tests.rs:5:9
[INFO] [stderr]   |
[INFO] [stderr] 5 |     let mut set = CoarseLockLinkedSet::<i32>::new();
[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]   --> tests/linked_set_tests.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let mut set = CoarseLockLinkedSet::<i32>::new();
[INFO] [stderr]    |         ----^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> tests/linked_set_tests.rs:40:9
[INFO] [stderr]    |
[INFO] [stderr] 40 |     let mut set = CoarseLockLinkedSet::<i32>::new();
[INFO] [stderr]    |         ----^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> tests/linked_set_tests.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 49 |     let mut set = CoarseLockLinkedSet::<i32>::new();
[INFO] [stderr]    |         ----^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> tests/linked_set_tests.rs:58:9
[INFO] [stderr]    |
[INFO] [stderr] 58 |     let mut set = CoarseLockLinkedSet::<i32>::new();
[INFO] [stderr]    |         ----^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> tests/linked_set_tests.rs:83:9
[INFO] [stderr]    |
[INFO] [stderr] 83 |     let mut set = CoarseLockLinkedSet::<i32>::new();
[INFO] [stderr]    |         ----^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> tests/linked_set_tests.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |     let mut set = CoarseLockLinkedSet::<i32>::new();
[INFO] [stderr]     |         ----^^^
[INFO] [stderr]     |         |
[INFO] [stderr]     |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.19s
[INFO] running `"docker" "inspect" "79aa295160dbe85766f63297b54e4db86754d04d7b16035ef73ca5765e4f1bf2"`
[INFO] running `"docker" "rm" "-f" "79aa295160dbe85766f63297b54e4db86754d04d7b16035ef73ca5765e4f1bf2"`
[INFO] [stdout] 79aa295160dbe85766f63297b54e4db86754d04d7b16035ef73ca5765e4f1bf2