Dec 19 22:13:44.043 INFO checking Qwertee/Kopier against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 22:13:44.043 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-5/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/Qwertee/Kopier:/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 22:13:44.518 INFO [stdout] 1d57cfe12d42eea8c9e35a67e66f6fe97854a4f6e3805a41805c6c8289589ca4
Dec 19 22:13:44.523 INFO running `"docker" "start" "-a" "1d57cfe12d42eea8c9e35a67e66f6fe97854a4f6e3805a41805c6c8289589ca4"`
Dec 19 22:13:45.889 INFO [stderr]     Checking kopier v0.1.0 (/opt/crater/workdir)
Dec 19 22:13:46.419 INFO [stderr] warning: variable does not need to be mutable
Dec 19 22:13:46.419 INFO [stderr]   --> src/main.rs:22:9
Dec 19 22:13:46.419 INFO [stderr]    |
Dec 19 22:13:46.419 INFO [stderr] 22 |     let mut dest_file = try!(File::create(dest_string));
Dec 19 22:13:46.419 INFO [stderr]    |         ----^^^^^^^^^
Dec 19 22:13:46.419 INFO [stderr]    |         |
Dec 19 22:13:46.419 INFO [stderr]    |         help: remove this `mut`
Dec 19 22:13:46.419 INFO [stderr]    |
Dec 19 22:13:46.419 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 22:13:46.419 INFO [stderr] 
Dec 19 22:13:46.428 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 22:13:46.428 INFO [stderr]   --> src/main.rs:32:5
Dec 19 22:13:46.428 INFO [stderr]    |
Dec 19 22:13:46.428 INFO [stderr] 32 |     f.write_all(data.as_bytes());
Dec 19 22:13:46.428 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 22:13:46.428 INFO [stderr]    |
Dec 19 22:13:46.428 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 22:13:46.428 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 22:13:46.428 INFO [stderr] 
Dec 19 22:13:46.527 INFO [stderr] warning: variable does not need to be mutable
Dec 19 22:13:46.527 INFO [stderr]   --> src/main.rs:22:9
Dec 19 22:13:46.527 INFO [stderr]    |
Dec 19 22:13:46.527 INFO [stderr] 22 |     let mut dest_file = try!(File::create(dest_string));
Dec 19 22:13:46.527 INFO [stderr]    |         ----^^^^^^^^^
Dec 19 22:13:46.527 INFO [stderr]    |         |
Dec 19 22:13:46.527 INFO [stderr]    |         help: remove this `mut`
Dec 19 22:13:46.527 INFO [stderr]    |
Dec 19 22:13:46.527 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 19 22:13:46.527 INFO [stderr] 
Dec 19 22:13:46.540 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 22:13:46.540 INFO [stderr]   --> src/main.rs:32:5
Dec 19 22:13:46.540 INFO [stderr]    |
Dec 19 22:13:46.540 INFO [stderr] 32 |     f.write_all(data.as_bytes());
Dec 19 22:13:46.540 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 22:13:46.540 INFO [stderr]    |
Dec 19 22:13:46.540 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 22:13:46.540 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 22:13:46.540 INFO [stderr] 
Dec 19 22:13:46.588 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.74s
Dec 19 22:13:47.354 INFO running `"docker" "inspect" "1d57cfe12d42eea8c9e35a67e66f6fe97854a4f6e3805a41805c6c8289589ca4"`
Dec 19 22:13:47.624 INFO running `"docker" "rm" "-f" "1d57cfe12d42eea8c9e35a67e66f6fe97854a4f6e3805a41805c6c8289589ca4"`
Dec 19 22:13:47.924 INFO [stdout] 1d57cfe12d42eea8c9e35a67e66f6fe97854a4f6e3805a41805c6c8289589ca4