Dec 19 12:13:37.899 INFO checking muktakosh/unicorn against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 12:13:37.899 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-2/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/muktakosh/unicorn:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 12:13:38.397 INFO [stdout] e1ced9a394a2d642416eb74f83624818f4bc6709d3684094e302e8fe07475ca3
Dec 19 12:13:38.399 INFO running `"docker" "start" "-a" "e1ced9a394a2d642416eb74f83624818f4bc6709d3684094e302e8fe07475ca3"`
Dec 19 12:13:40.076 INFO [stderr]    Compiling rustc-serialize v0.3.22
Dec 19 12:13:40.078 INFO [stderr]     Checking bytes v0.3.0
Dec 19 12:13:40.078 INFO [stderr]     Checking slab v0.1.3
Dec 19 12:13:40.078 INFO [stderr]    Compiling ws2_32-sys v0.2.1
Dec 19 12:13:40.078 INFO [stderr]     Checking net2 v0.2.26
Dec 19 12:13:40.078 INFO [stderr]     Checking nix v0.5.1
Dec 19 12:13:40.080 INFO [stderr]     Checking url v1.2.4
Dec 19 12:13:40.080 INFO [stderr]    Compiling term v0.4.4
Dec 19 12:13:43.277 INFO [stderr]     Checking miow v0.1.5
Dec 19 12:13:51.569 INFO [stderr]     Checking mio v0.5.1
Dec 19 12:13:53.361 INFO [stderr]     Checking ws v0.5.3
Dec 19 12:13:56.417 INFO [stderr]    Compiling syntex_pos v0.52.0
Dec 19 12:13:58.182 INFO [stderr]    Compiling syntex_errors v0.52.0
Dec 19 12:14:01.990 INFO [stderr]    Compiling syntex_syntax v0.52.0
Dec 19 12:14:44.838 INFO [stderr]    Compiling syntex v0.52.0
Dec 19 12:14:46.165 INFO [stderr]    Compiling serde_codegen v0.8.21
Dec 19 12:14:51.311 INFO [stderr]    Compiling libunicorn v0.0.1 (/opt/crater/workdir)
Dec 19 12:14:54.925 INFO [stderr] warning: variable does not need to be mutable
Dec 19 12:14:54.925 INFO [stderr]   --> src/router.rs:80:21
Dec 19 12:14:54.925 INFO [stderr]    |
Dec 19 12:14:54.925 INFO [stderr] 80 |         if let Some(mut t) = self.topics.get_mut(topic_id) {
Dec 19 12:14:54.925 INFO [stderr]    |                     ----^
Dec 19 12:14:54.925 INFO [stderr]    |                     |
Dec 19 12:14:54.925 INFO [stderr]    |                     help: remove this `mut`
Dec 19 12:14:54.925 INFO [stderr]    |
Dec 19 12:14:54.925 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 12:14:54.925 INFO [stderr] 
Dec 19 12:14:54.937 INFO [stderr] warning: variable does not need to be mutable
Dec 19 12:14:54.937 INFO [stderr]   --> src/router.rs:80:21
Dec 19 12:14:54.937 INFO [stderr]    |
Dec 19 12:14:54.937 INFO [stderr] 80 |         if let Some(mut t) = self.topics.get_mut(topic_id) {
Dec 19 12:14:54.937 INFO [stderr]    |                     ----^
Dec 19 12:14:54.937 INFO [stderr]    |                     |
Dec 19 12:14:54.937 INFO [stderr]    |                     help: remove this `mut`
Dec 19 12:14:54.937 INFO [stderr]    |
Dec 19 12:14:54.937 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 12:14:54.937 INFO [stderr] 
Dec 19 12:14:55.544 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 15s
Dec 19 12:14:56.020 INFO running `"docker" "inspect" "e1ced9a394a2d642416eb74f83624818f4bc6709d3684094e302e8fe07475ca3"`
Dec 19 12:14:56.134 INFO running `"docker" "rm" "-f" "e1ced9a394a2d642416eb74f83624818f4bc6709d3684094e302e8fe07475ca3"`
Dec 19 12:14:56.211 INFO [stdout] e1ced9a394a2d642416eb74f83624818f4bc6709d3684094e302e8fe07475ca3