[INFO] updating cached repository dmdrummond/mandelbrot
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/dmdrummond/mandelbrot
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/dmdrummond/mandelbrot" "work/ex/clippy-test-run/sources/stable/gh/dmdrummond/mandelbrot"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/dmdrummond/mandelbrot'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dmdrummond/mandelbrot" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/dmdrummond/mandelbrot"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/dmdrummond/mandelbrot'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8dd70ffe7f24420dedc3787400755898f43178c8
[INFO] sha for GitHub repo dmdrummond/mandelbrot: 8dd70ffe7f24420dedc3787400755898f43178c8
[INFO] validating manifest of dmdrummond/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 dmdrummond/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 dmdrummond/mandelbrot
[INFO] finished frobbing dmdrummond/mandelbrot
[INFO] frobbed toml for dmdrummond/mandelbrot written to work/ex/clippy-test-run/sources/stable/gh/dmdrummond/mandelbrot/Cargo.toml
[INFO] started frobbing dmdrummond/mandelbrot
[INFO] finished frobbing dmdrummond/mandelbrot
[INFO] frobbed toml for dmdrummond/mandelbrot written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/dmdrummond/mandelbrot/Cargo.toml
[INFO] crate dmdrummond/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 dmdrummond/mandelbrot against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-5/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/dmdrummond/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] 81a9f3697018bba052c7164eb2affb065a1bb55009c75375ebf1f59e75f725d6
[INFO] running `"docker" "start" "-a" "81a9f3697018bba052c7164eb2affb065a1bb55009c75375ebf1f59e75f725d6"`
[INFO] [stderr]     Checking rayon-core v1.3.0
[INFO] [stderr]     Checking num-bigint v0.1.41
[INFO] [stderr]     Checking rayon v0.8.2
[INFO] [stderr]     Checking num-rational v0.1.40
[INFO] [stderr]     Checking num v0.1.41
[INFO] [stderr]     Checking jpeg-decoder v0.1.13
[INFO] [stderr]     Checking image v0.18.0
[INFO] [stderr]     Checking mandelbrot v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/main.rs:14:26
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let x_factor = 3.5 / width as f64;
[INFO] [stderr]    |                          ^^^^^^^^^^^^ help: try: `f64::from(width)`
[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 f64 may become silently lossy if types change
[INFO] [stderr]   --> src/main.rs:15:26
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let y_factor = 2.0 / height as f64;
[INFO] [stderr]    |                          ^^^^^^^^^^^^^ help: try: `f64::from(height)`
[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: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/main.rs:19:31
[INFO] [stderr]    |
[INFO] [stderr] 19 |         let c = Complex::new((x as f64 * x_factor) - 2.5, (y as f64 * y_factor) - 1.0 );
[INFO] [stderr]    |                               ^^^^^^^^ help: try: `f64::from(x)`
[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: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/main.rs:19:60
[INFO] [stderr]    |
[INFO] [stderr] 19 |         let c = Complex::new((x as f64 * x_factor) - 2.5, (y as f64 * y_factor) - 1.0 );
[INFO] [stderr]    |                                                            ^^^^^^^^ help: try: `f64::from(y)`
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/main.rs:24:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |             i = i + 1;
[INFO] [stderr]    |             ^^^^^^^^^ help: replace it with: `i += 1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/main.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let ref mut fout = File::create("fractal3.png").unwrap();
[INFO] [stderr]    |     ----^^^^^^^^^^^^----------------------------------------- help: try: `let fout = &mut File::create("fractal3.png").unwrap();`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr] warning: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/main.rs:14:26
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let x_factor = 3.5 / width as f64;
[INFO] [stderr]    |                          ^^^^^^^^^^^^ help: try: `f64::from(width)`
[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 f64 may become silently lossy if types change
[INFO] [stderr]   --> src/main.rs:15:26
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let y_factor = 2.0 / height as f64;
[INFO] [stderr]    |                          ^^^^^^^^^^^^^ help: try: `f64::from(height)`
[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: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/main.rs:19:31
[INFO] [stderr]    |
[INFO] [stderr] 19 |         let c = Complex::new((x as f64 * x_factor) - 2.5, (y as f64 * y_factor) - 1.0 );
[INFO] [stderr]    |                               ^^^^^^^^ help: try: `f64::from(x)`
[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: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]   --> src/main.rs:19:60
[INFO] [stderr]    |
[INFO] [stderr] 19 |         let c = Complex::new((x as f64 * x_factor) - 2.5, (y as f64 * y_factor) - 1.0 );
[INFO] [stderr]    |                                                            ^^^^^^^^ help: try: `f64::from(y)`
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/main.rs:24:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |             i = i + 1;
[INFO] [stderr]    |             ^^^^^^^^^ help: replace it with: `i += 1`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::assign_op_pattern)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assign_op_pattern
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/main.rs:34:9
[INFO] [stderr]    |
[INFO] [stderr] 34 |     let ref mut fout = File::create("fractal3.png").unwrap();
[INFO] [stderr]    |     ----^^^^^^^^^^^^----------------------------------------- help: try: `let fout = &mut File::create("fractal3.png").unwrap();`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::toplevel_ref_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#toplevel_ref_arg
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.77s
[INFO] running `"docker" "inspect" "81a9f3697018bba052c7164eb2affb065a1bb55009c75375ebf1f59e75f725d6"`
[INFO] running `"docker" "rm" "-f" "81a9f3697018bba052c7164eb2affb065a1bb55009c75375ebf1f59e75f725d6"`
[INFO] [stdout] 81a9f3697018bba052c7164eb2affb065a1bb55009c75375ebf1f59e75f725d6