Dec 18 06:52:11.225 INFO checking KuabeM/working-time-calculator against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 06:52:11.225 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-3/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/KuabeM/working-time-calculator:/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 06:52:11.746 INFO [stdout] 061f042c6053f0b59b5374641c2cdee9dae0402b6da8485e5434a12f620b11f1
Dec 18 06:52:11.754 INFO running `"docker" "start" "-a" "061f042c6053f0b59b5374641c2cdee9dae0402b6da8485e5434a12f620b11f1"`
Dec 18 06:52:13.268 INFO [stderr]     Checking working-time-calc v0.1.0 (/opt/crater/workdir)
Dec 18 06:52:13.839 INFO [stderr] warning: value assigned to `content` is never read
Dec 18 06:52:13.839 INFO [stderr]    --> src/main.rs:117:13
Dec 18 06:52:13.839 INFO [stderr]     |
Dec 18 06:52:13.840 INFO [stderr] 117 |     let mut content = String::new();
Dec 18 06:52:13.844 INFO [stderr]     |             ^^^^^^^
Dec 18 06:52:13.844 INFO [stderr]     |
Dec 18 06:52:13.844 INFO [stderr]     = note: #[warn(unused_assignments)] on by default
Dec 18 06:52:13.844 INFO [stderr] 
Dec 18 06:52:13.855 INFO [stderr] warning: value assigned to `content` is never read
Dec 18 06:52:13.855 INFO [stderr]    --> src/main.rs:117:13
Dec 18 06:52:13.856 INFO [stderr]     |
Dec 18 06:52:13.860 INFO [stderr] 117 |     let mut content = String::new();
Dec 18 06:52:13.860 INFO [stderr]     |             ^^^^^^^
Dec 18 06:52:13.860 INFO [stderr]     |
Dec 18 06:52:13.860 INFO [stderr]     = note: #[warn(unused_assignments)] on by default
Dec 18 06:52:13.860 INFO [stderr] 
Dec 18 06:52:13.873 INFO [stderr] warning: variable does not need to be mutable
Dec 18 06:52:13.876 INFO [stderr]    --> src/main.rs:108:9
Dec 18 06:52:13.876 INFO [stderr]     |
Dec 18 06:52:13.876 INFO [stderr] 108 |     let mut content_opt = match read_file_to_string( &file_name) {
Dec 18 06:52:13.876 INFO [stderr]     |         ----^^^^^^^^^^^
Dec 18 06:52:13.876 INFO [stderr]     |         |
Dec 18 06:52:13.876 INFO [stderr]     |         help: remove this `mut`
Dec 18 06:52:13.876 INFO [stderr]     |
Dec 18 06:52:13.876 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 18 06:52:13.876 INFO [stderr] 
Dec 18 06:52:13.912 INFO [stderr] warning: variable does not need to be mutable
Dec 18 06:52:13.913 INFO [stderr]    --> src/main.rs:108:9
Dec 18 06:52:13.913 INFO [stderr]     |
Dec 18 06:52:13.913 INFO [stderr] 108 |     let mut content_opt = match read_file_to_string( &file_name) {
Dec 18 06:52:13.916 INFO [stderr]     |         ----^^^^^^^^^^^
Dec 18 06:52:13.916 INFO [stderr]     |         |
Dec 18 06:52:13.916 INFO [stderr]     |         help: remove this `mut`
Dec 18 06:52:13.916 INFO [stderr]     |
Dec 18 06:52:13.916 INFO [stderr]     = note: #[warn(unused_mut)] on by default
Dec 18 06:52:13.916 INFO [stderr] 
Dec 18 06:52:14.030 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.82s
Dec 18 06:52:14.826 INFO running `"docker" "inspect" "061f042c6053f0b59b5374641c2cdee9dae0402b6da8485e5434a12f620b11f1"`
Dec 18 06:52:15.164 INFO running `"docker" "rm" "-f" "061f042c6053f0b59b5374641c2cdee9dae0402b6da8485e5434a12f620b11f1"`
Dec 18 06:52:15.568 INFO [stdout] 061f042c6053f0b59b5374641c2cdee9dae0402b6da8485e5434a12f620b11f1