[INFO] updating cached repository KuabeM/working-time-calculator
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/KuabeM/working-time-calculator
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/KuabeM/working-time-calculator" "work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/KuabeM/working-time-calculator"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/KuabeM/working-time-calculator'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/KuabeM/working-time-calculator" "work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/KuabeM/working-time-calculator"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/KuabeM/working-time-calculator'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ae8e54c25caec34c3fbb549d8e2c321abe6004e0
[INFO] sha for GitHub repo KuabeM/working-time-calculator: ae8e54c25caec34c3fbb549d8e2c321abe6004e0
[INFO] validating manifest of KuabeM/working-time-calculator on toolchain master#0f88167f89fffe321590c5148f21b7d51d44388d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of KuabeM/working-time-calculator on toolchain try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing KuabeM/working-time-calculator
[INFO] finished frobbing KuabeM/working-time-calculator
[INFO] frobbed toml for KuabeM/working-time-calculator written to work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/KuabeM/working-time-calculator/Cargo.toml
[INFO] started frobbing KuabeM/working-time-calculator
[INFO] finished frobbing KuabeM/working-time-calculator
[INFO] frobbed toml for KuabeM/working-time-calculator written to work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/KuabeM/working-time-calculator/Cargo.toml
[INFO] crate KuabeM/working-time-calculator already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking KuabeM/working-time-calculator against try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b for pr-58948
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58948/worker-1/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/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" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] bf8b5fb25bdf27032415ac3385a0003c5c8eefa0a391bfbc16b0293a24ae90dc
[INFO] running `"docker" "start" "-a" "bf8b5fb25bdf27032415ac3385a0003c5c8eefa0a391bfbc16b0293a24ae90dc"`
[INFO] [stderr]     Checking working-time-calc v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `content` is never read
[INFO] [stderr]    --> src/main.rs:117:13
[INFO] [stderr]     |
[INFO] [stderr] 117 |     let mut content = String::new();
[INFO] [stderr]     |             ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |     let mut content_opt = match read_file_to_string( &file_name) {
[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: value assigned to `content` is never read
[INFO] [stderr]    --> src/main.rs:117:13
[INFO] [stderr]     |
[INFO] [stderr] 117 |     let mut content = String::new();
[INFO] [stderr]     |             ^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]     = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/main.rs:108:9
[INFO] [stderr]     |
[INFO] [stderr] 108 |     let mut content_opt = match read_file_to_string( &file_name) {
[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]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `"docker" "inspect" "bf8b5fb25bdf27032415ac3385a0003c5c8eefa0a391bfbc16b0293a24ae90dc"`
[INFO] running `"docker" "rm" "-f" "bf8b5fb25bdf27032415ac3385a0003c5c8eefa0a391bfbc16b0293a24ae90dc"`
[INFO] [stdout] bf8b5fb25bdf27032415ac3385a0003c5c8eefa0a391bfbc16b0293a24ae90dc