Dec 12 14:26:03.105 INFO checking gitter-slack-0.1.1 against try#aa9aa79c3c583aab59ac9134542d60a780c35e2e for pr-56677
Dec 12 14:26:03.105 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-1/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-1/pr-56677/try#aa9aa79c3c583aab59ac9134542d60a780c35e2e:/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 +aa9aa79c3c583aab59ac9134542d60a780c35e2e-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 14:26:03.522 INFO [stdout] 6868e17725f46c216860afb5bd39869098f223c0621c1d422db5fee06788cf69
Dec 12 14:26:03.524 INFO running `"docker" "start" "-a" "6868e17725f46c216860afb5bd39869098f223c0621c1d422db5fee06788cf69"`
Dec 12 14:26:04.628 INFO [stderr] usermod: no changes
Dec 12 14:26:04.688 INFO [stderr] warning: only one of `license` or `license-file` is necessary
Dec 12 14:26:04.991 INFO [stderr]     Checking chrono v0.4.6
Dec 12 14:26:07.508 INFO [stderr]     Checking gitter-slack v0.1.1 (/source)
Dec 12 14:26:17.004 INFO [stderr] warning: variable does not need to be mutable
Dec 12 14:26:17.005 INFO [stderr]    --> src/main.rs:139:17
Dec 12 14:26:17.005 INFO [stderr]     |
Dec 12 14:26:17.005 INFO [stderr] 139 |             let mut bf = &mut buffer;
Dec 12 14:26:17.005 INFO [stderr]     |                 ----^^
Dec 12 14:26:17.006 INFO [stderr]     |                 |
Dec 12 14:26:17.006 INFO [stderr]     |                 help: remove this `mut`
Dec 12 14:26:17.006 INFO [stderr]     |
Dec 12 14:26:17.006 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 12 14:26:17.006 INFO [stderr] 
Dec 12 14:26:17.007 INFO [stderr] warning: variable does not need to be mutable
Dec 12 14:26:17.007 INFO [stderr]    --> src/main.rs:139:17
Dec 12 14:26:17.007 INFO [stderr]     |
Dec 12 14:26:17.007 INFO [stderr] 139 |             let mut bf = &mut buffer;
Dec 12 14:26:17.008 INFO [stderr]     |                 ----^^
Dec 12 14:26:17.008 INFO [stderr]     |                 |
Dec 12 14:26:17.008 INFO [stderr]     |                 help: remove this `mut`
Dec 12 14:26:17.008 INFO [stderr]     |
Dec 12 14:26:17.009 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 12 14:26:17.009 INFO [stderr] 
Dec 12 14:26:17.143 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.49s
Dec 12 14:26:17.169 INFO [stderr] su: No module specific data is present
Dec 12 14:26:18.214 INFO running `"docker" "inspect" "6868e17725f46c216860afb5bd39869098f223c0621c1d422db5fee06788cf69"`
Dec 12 14:26:18.630 INFO running `"docker" "rm" "-f" "6868e17725f46c216860afb5bd39869098f223c0621c1d422db5fee06788cf69"`
Dec 12 14:26:18.988 INFO [stdout] 6868e17725f46c216860afb5bd39869098f223c0621c1d422db5fee06788cf69