[INFO] updating cached repository letaron/tacron
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/letaron/tacron
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/letaron/tacron" "work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/letaron/tacron"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/letaron/tacron'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/letaron/tacron" "work/ex/pr-60039/sources/try#78b0bd8441ef961f6475e3d47fe3bca38cb83432/gh/letaron/tacron"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039/sources/try#78b0bd8441ef961f6475e3d47fe3bca38cb83432/gh/letaron/tacron'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 527dbf5554bd6347eea9ed2e8c9b9bfc09c53317
[INFO] sha for GitHub repo letaron/tacron: 527dbf5554bd6347eea9ed2e8c9b9bfc09c53317
[INFO] validating manifest of letaron/tacron on toolchain master#efe2f32a6b8217425f361ec7c206910c611c03ee
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of letaron/tacron on toolchain try#78b0bd8441ef961f6475e3d47fe3bca38cb83432
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78b0bd8441ef961f6475e3d47fe3bca38cb83432-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing letaron/tacron
[INFO] finished frobbing letaron/tacron
[INFO] frobbed toml for letaron/tacron written to work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/letaron/tacron/Cargo.toml
[INFO] started frobbing letaron/tacron
[INFO] finished frobbing letaron/tacron
[INFO] frobbed toml for letaron/tacron written to work/ex/pr-60039/sources/try#78b0bd8441ef961f6475e3d47fe3bca38cb83432/gh/letaron/tacron/Cargo.toml
[INFO] crate letaron/tacron already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+78b0bd8441ef961f6475e3d47fe3bca38cb83432-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking letaron/tacron against master#efe2f32a6b8217425f361ec7c206910c611c03ee for pr-60039
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039/worker-0/master#efe2f32a6b8217425f361ec7c206910c611c03ee:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039/sources/master#efe2f32a6b8217425f361ec7c206910c611c03ee/gh/letaron/tacron:/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" "+efe2f32a6b8217425f361ec7c206910c611c03ee-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 87bb45e9407380a6f8748699821639f45c23130eb19983abe9ccf719b2df9e46
[INFO] running `"docker" "start" "-a" "87bb45e9407380a6f8748699821639f45c23130eb19983abe9ccf719b2df9e46"`
[INFO] [stderr]     Checking yaml-rust v0.4.3
[INFO] [stderr]     Checking nom v4.2.2
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking config v0.9.2
[INFO] [stderr]     Checking tacron v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]   --> src/time_units/days_of_week.rs:63:9
[INFO] [stderr]    |
[INFO] [stderr] 63 |         DaysOfWeek::value_from_name("foo").is_err();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::result::Result::<T, E>::is_err` that must be used
[INFO] [stderr]   --> src/time_units/months.rs:73:9
[INFO] [stderr]    |
[INFO] [stderr] 73 |         Months::value_from_name("foo").is_err();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.45s
[INFO] running `"docker" "inspect" "87bb45e9407380a6f8748699821639f45c23130eb19983abe9ccf719b2df9e46"`
[INFO] running `"docker" "rm" "-f" "87bb45e9407380a6f8748699821639f45c23130eb19983abe9ccf719b2df9e46"`
[INFO] [stdout] 87bb45e9407380a6f8748699821639f45c23130eb19983abe9ccf719b2df9e46