[INFO] updating cached repository koshkin-kna/rust-learn
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/koshkin-kna/rust-learn
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/koshkin-kna/rust-learn" "work/ex/clippy-test-run/sources/stable/gh/koshkin-kna/rust-learn"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/koshkin-kna/rust-learn'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/koshkin-kna/rust-learn" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/koshkin-kna/rust-learn"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/koshkin-kna/rust-learn'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1c7a0e3513e67fcc84f652742de2f10b5d159f72
[INFO] sha for GitHub repo koshkin-kna/rust-learn: 1c7a0e3513e67fcc84f652742de2f10b5d159f72
[INFO] validating manifest of koshkin-kna/rust-learn 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 koshkin-kna/rust-learn 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 koshkin-kna/rust-learn
[INFO] finished frobbing koshkin-kna/rust-learn
[INFO] frobbed toml for koshkin-kna/rust-learn written to work/ex/clippy-test-run/sources/stable/gh/koshkin-kna/rust-learn/Cargo.toml
[INFO] started frobbing koshkin-kna/rust-learn
[INFO] finished frobbing koshkin-kna/rust-learn
[INFO] frobbed toml for koshkin-kna/rust-learn written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/koshkin-kna/rust-learn/Cargo.toml
[INFO] crate koshkin-kna/rust-learn has a lockfile. skipping
[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 koshkin-kna/rust-learn against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-2/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/koshkin-kna/rust-learn:/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] f008f79a10f5b4a059d75e0eb9bed61afe6a0b8014242e107bf4db81574871c9
[INFO] running `"docker" "start" "-a" "f008f79a10f5b4a059d75e0eb9bed61afe6a0b8014242e107bf4db81574871c9"`
[INFO] [stderr]    Compiling num-derive v0.2.2
[INFO] [stderr]     Checking image v0.19.0
[INFO] [stderr]     Checking learn v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:76:25
[INFO] [stderr]    |
[INFO] [stderr] 76 |             Err(err) => return Err(err.to_string())
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Err(err.to_string())`
[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: unneeded return statement
[INFO] [stderr]   --> src/lib.rs:76:25
[INFO] [stderr]    |
[INFO] [stderr] 76 |             Err(err) => return Err(err.to_string())
[INFO] [stderr]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Err(err.to_string())`
[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]     Finished dev [unoptimized + debuginfo] target(s) in 12.62s
[INFO] running `"docker" "inspect" "f008f79a10f5b4a059d75e0eb9bed61afe6a0b8014242e107bf4db81574871c9"`
[INFO] running `"docker" "rm" "-f" "f008f79a10f5b4a059d75e0eb9bed61afe6a0b8014242e107bf4db81574871c9"`
[INFO] [stdout] f008f79a10f5b4a059d75e0eb9bed61afe6a0b8014242e107bf4db81574871c9