[INFO] crate durationfmt 0.1.1 is already in cache
[INFO] extracting crate durationfmt 0.1.1 into work/ex/clippy-test-run/sources/stable/reg/durationfmt/0.1.1
[INFO] extracting crate durationfmt 0.1.1 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/durationfmt/0.1.1
[INFO] validating manifest of durationfmt-0.1.1 on toolchain stable
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of durationfmt-0.1.1 on toolchain stable+rustflags=-Dclippy::into_iter_on_array
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing durationfmt-0.1.1
[INFO] finished frobbing durationfmt-0.1.1
[INFO] frobbed toml for durationfmt-0.1.1 written to work/ex/clippy-test-run/sources/stable/reg/durationfmt/0.1.1/Cargo.toml
[INFO] started frobbing durationfmt-0.1.1
[INFO] finished frobbing durationfmt-0.1.1
[INFO] frobbed toml for durationfmt-0.1.1 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/durationfmt/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] linting durationfmt-0.1.1 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-4/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/durationfmt/0.1.1:/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" "+stable" "clippy" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 03dcbd1d9e819b739e69519d2af5935749d16b581fef2f1ff88e162aea919bba
[INFO] running `"docker" "start" "-a" "03dcbd1d9e819b739e69519d2af5935749d16b581fef2f1ff88e162aea919bba"`
[INFO] [stderr]     Checking durationfmt v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:77:3
[INFO] [stderr]    |
[INFO] [stderr] 77 |   return String::from_utf8_lossy(&buf[w..]).into_owned();
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `String::from_utf8_lossy(&buf[w..]).into_owned()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `prec` is never read
[INFO] [stderr]   --> src/lib.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let mut prec = 0;
[INFO] [stderr]    |             ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to u64 may become silently lossy if types change
[INFO] [stderr]   --> src/lib.rs:46:46
[INFO] [stderr]    |
[INFO] [stderr] 46 |     let (mut w, u) = fmt_frac(&mut buf[..w], nanos as u64, prec);
[INFO] [stderr]    |                                              ^^^^^^^^^^^^ help: try: `u64::from(nanos)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::cast_lossless)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to u64 may become silently lossy if types change
[INFO] [stderr]   --> src/lib.rs:55:44
[INFO] [stderr]    |
[INFO] [stderr] 55 |   let (mut w, _) = fmt_frac(&mut buf[..w], nanos as u64, 9);
[INFO] [stderr]    |                                            ^^^^^^^^^^^^ help: try: `u64::from(nanos)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:77:3
[INFO] [stderr]    |
[INFO] [stderr] 77 |   return String::from_utf8_lossy(&buf[w..]).into_owned();
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `String::from_utf8_lossy(&buf[w..]).into_owned()`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_return)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: digits grouped inconsistently by underscores
[INFO] [stderr]    --> src/lib.rs:136:52
[INFO] [stderr]     |
[INFO] [stderr] 136 |     assert_eq!("2.2ms", to_string(Duration::new(0, 2200_000)));
[INFO] [stderr]     |                                                    ^^^^^^^^ help: consider: `2_200_000`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::inconsistent_digit_grouping)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#inconsistent_digit_grouping
[INFO] [stderr] 
[INFO] [stderr] warning: long literal lacking separators
[INFO] [stderr]    --> src/lib.rs:153:10
[INFO] [stderr]     |
[INFO] [stderr] 153 |         (2562047 * 60 * 60) + (47 * 60) + 16,
[INFO] [stderr]     |          ^^^^^^^ help: consider: `2_562_047`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::unreadable_literal)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unreadable_literal
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `prec` is never read
[INFO] [stderr]   --> src/lib.rs:22:13
[INFO] [stderr]    |
[INFO] [stderr] 22 |     let mut prec = 0;
[INFO] [stderr]    |             ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to u64 may become silently lossy if types change
[INFO] [stderr]   --> src/lib.rs:46:46
[INFO] [stderr]    |
[INFO] [stderr] 46 |     let (mut w, u) = fmt_frac(&mut buf[..w], nanos as u64, prec);
[INFO] [stderr]    |                                              ^^^^^^^^^^^^ help: try: `u64::from(nanos)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::cast_lossless)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to u64 may become silently lossy if types change
[INFO] [stderr]   --> src/lib.rs:55:44
[INFO] [stderr]    |
[INFO] [stderr] 55 |   let (mut w, _) = fmt_frac(&mut buf[..w], nanos as u64, 9);
[INFO] [stderr]    |                                            ^^^^^^^^^^^^ help: try: `u64::from(nanos)`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cast_lossless
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.18s
[INFO] running `"docker" "inspect" "03dcbd1d9e819b739e69519d2af5935749d16b581fef2f1ff88e162aea919bba"`
[INFO] running `"docker" "rm" "-f" "03dcbd1d9e819b739e69519d2af5935749d16b581fef2f1ff88e162aea919bba"`
[INFO] [stdout] 03dcbd1d9e819b739e69519d2af5935749d16b581fef2f1ff88e162aea919bba