[INFO] updating cached repository aleksey-orekhov/mandelbrot
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/aleksey-orekhov/mandelbrot
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/aleksey-orekhov/mandelbrot" "work/ex/clippy-test-run/sources/stable/gh/aleksey-orekhov/mandelbrot"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/aleksey-orekhov/mandelbrot'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/aleksey-orekhov/mandelbrot" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/aleksey-orekhov/mandelbrot"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/aleksey-orekhov/mandelbrot'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 0bafb17e009d7640f185ab42a6a9e32611189024
[INFO] sha for GitHub repo aleksey-orekhov/mandelbrot: 0bafb17e009d7640f185ab42a6a9e32611189024
[INFO] validating manifest of aleksey-orekhov/mandelbrot 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 aleksey-orekhov/mandelbrot 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 aleksey-orekhov/mandelbrot
[INFO] finished frobbing aleksey-orekhov/mandelbrot
[INFO] frobbed toml for aleksey-orekhov/mandelbrot written to work/ex/clippy-test-run/sources/stable/gh/aleksey-orekhov/mandelbrot/Cargo.toml
[INFO] started frobbing aleksey-orekhov/mandelbrot
[INFO] finished frobbing aleksey-orekhov/mandelbrot
[INFO] frobbed toml for aleksey-orekhov/mandelbrot written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/aleksey-orekhov/mandelbrot/Cargo.toml
[INFO] crate aleksey-orekhov/mandelbrot 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 aleksey-orekhov/mandelbrot against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-6/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/aleksey-orekhov/mandelbrot:/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] 249c1cbc04a52026eff53ca5a17333b14e916022b3f9ad42d4b7b052e7cedfbe
[INFO] running `"docker" "start" "-a" "249c1cbc04a52026eff53ca5a17333b14e916022b3f9ad42d4b7b052e7cedfbe"`
[INFO] [stderr]     Checking lzw v0.9.0
[INFO] [stderr]     Checking png v0.4.3
[INFO] [stderr]     Checking enum_primitive v0.1.0
[INFO] [stderr]     Checking gif v0.7.0
[INFO] [stderr]     Checking image v0.6.1
[INFO] [stderr]     Checking mandelbrot v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:129:5
[INFO] [stderr]     |
[INFO] [stderr] 129 |     return None;
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: remove `return` as shown: `None`
[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: use of `writeln!(stderr(), ...).unwrap()`. Consider using `eprintln!` instead
[INFO] [stderr]   --> src/main.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 | /         writeln!(std::io::stderr(),
[INFO] [stderr] 21 | |                  "Usage: mandelbrot FILE THREADS PIXELS UPPERLEFT LOWERRIGHT")
[INFO] [stderr] 22 | |             .unwrap();
[INFO] [stderr]    | |_____________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::explicit_write)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_write
[INFO] [stderr] 
[INFO] [stderr] warning: use of `writeln!(stderr(), ...).unwrap()`. Consider using `eprintln!` instead
[INFO] [stderr]   --> src/main.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 | /         writeln!(std::io::stderr(),
[INFO] [stderr] 24 | |                  "Example: {} mandel.png 2 1000x750 -1.20,0.35 -1,0.20",
[INFO] [stderr] 25 | |                  args[0])
[INFO] [stderr] 26 | |             .unwrap();
[INFO] [stderr]    | |_____________________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_write
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/main.rs:129:5
[INFO] [stderr]     |
[INFO] [stderr] 129 |     return None;
[INFO] [stderr]     |     ^^^^^^^^^^^^ help: remove `return` as shown: `None`
[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: use of `writeln!(stderr(), ...).unwrap()`. Consider using `eprintln!` instead
[INFO] [stderr]   --> src/main.rs:20:9
[INFO] [stderr]    |
[INFO] [stderr] 20 | /         writeln!(std::io::stderr(),
[INFO] [stderr] 21 | |                  "Usage: mandelbrot FILE THREADS PIXELS UPPERLEFT LOWERRIGHT")
[INFO] [stderr] 22 | |             .unwrap();
[INFO] [stderr]    | |_____________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::explicit_write)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_write
[INFO] [stderr] 
[INFO] [stderr] warning: use of `writeln!(stderr(), ...).unwrap()`. Consider using `eprintln!` instead
[INFO] [stderr]   --> src/main.rs:23:9
[INFO] [stderr]    |
[INFO] [stderr] 23 | /         writeln!(std::io::stderr(),
[INFO] [stderr] 24 | |                  "Example: {} mandel.png 2 1000x750 -1.20,0.35 -1,0.20",
[INFO] [stderr] 25 | |                  args[0])
[INFO] [stderr] 26 | |             .unwrap();
[INFO] [stderr]    | |_____________________^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_write
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.65s
[INFO] running `"docker" "inspect" "249c1cbc04a52026eff53ca5a17333b14e916022b3f9ad42d4b7b052e7cedfbe"`
[INFO] running `"docker" "rm" "-f" "249c1cbc04a52026eff53ca5a17333b14e916022b3f9ad42d4b7b052e7cedfbe"`
[INFO] [stdout] 249c1cbc04a52026eff53ca5a17333b14e916022b3f9ad42d4b7b052e7cedfbe