[INFO] updating cached repository ProgrammingRust/mandelbrot
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ProgrammingRust/mandelbrot
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ProgrammingRust/mandelbrot" "work/ex/clippy-test-run/sources/stable/gh/ProgrammingRust/mandelbrot"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/ProgrammingRust/mandelbrot'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ProgrammingRust/mandelbrot" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/ProgrammingRust/mandelbrot"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/ProgrammingRust/mandelbrot'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8a9abadc21c20ecea5522e808d92397b1bf6638e
[INFO] sha for GitHub repo ProgrammingRust/mandelbrot: 8a9abadc21c20ecea5522e808d92397b1bf6638e
[INFO] validating manifest of ProgrammingRust/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 ProgrammingRust/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 ProgrammingRust/mandelbrot
[INFO] finished frobbing ProgrammingRust/mandelbrot
[INFO] frobbed toml for ProgrammingRust/mandelbrot written to work/ex/clippy-test-run/sources/stable/gh/ProgrammingRust/mandelbrot/Cargo.toml
[INFO] started frobbing ProgrammingRust/mandelbrot
[INFO] finished frobbing ProgrammingRust/mandelbrot
[INFO] frobbed toml for ProgrammingRust/mandelbrot written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/ProgrammingRust/mandelbrot/Cargo.toml
[INFO] crate ProgrammingRust/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 ProgrammingRust/mandelbrot against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-1/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/ProgrammingRust/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] fdbf27c3e75a8a81699229c830bffa348f9685967b5792b3ad1f35bf289504c2
[INFO] running `"docker" "start" "-a" "fdbf27c3e75a8a81699229c830bffa348f9685967b5792b3ad1f35bf289504c2"`
[INFO] [stderr]     Checking num-complex v0.1.41
[INFO] [stderr]     Checking num-bigint v0.1.41
[INFO] [stderr]     Checking rayon v0.8.2
[INFO] [stderr]     Checking png v0.5.2
[INFO] [stderr]     Checking num-rational v0.1.41
[INFO] [stderr]     Checking num v0.1.41
[INFO] [stderr]     Checking jpeg-decoder v0.1.13
[INFO] [stderr]     Checking image v0.10.4
[INFO] [stderr]     Checking mandelbrot v0.2.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]   --> src/main.rs:88:5
[INFO] [stderr]    |
[INFO] [stderr] 88 |     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: unneeded return statement
[INFO] [stderr]   --> src/main.rs:88:5
[INFO] [stderr]    |
[INFO] [stderr] 88 |     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:156:9
[INFO] [stderr]     |
[INFO] [stderr] 156 | /         writeln!(std::io::stderr(),
[INFO] [stderr] 157 | |                  "Usage: mandelbrot FILE PIXELS UPPERLEFT LOWERRIGHT")
[INFO] [stderr] 158 | |             .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:159:9
[INFO] [stderr]     |
[INFO] [stderr] 159 | /         writeln!(std::io::stderr(),
[INFO] [stderr] 160 | |                  "Example: {} mandel.png 1000x750 -1.20,0.35 -1,0.20",
[INFO] [stderr] 161 | |                  args[0])
[INFO] [stderr] 162 | |             .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: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:214:40
[INFO] [stderr]     |
[INFO] [stderr] 214 |                  dt.as_secs() as f64 + dt.subsec_nanos() as f64 * 1e-9);
[INFO] [stderr]     |                                        ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(dt.subsec_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: use of `writeln!(stderr(), ...).unwrap()`. Consider using `eprintln!` instead
[INFO] [stderr]    --> src/main.rs:156:9
[INFO] [stderr]     |
[INFO] [stderr] 156 | /         writeln!(std::io::stderr(),
[INFO] [stderr] 157 | |                  "Usage: mandelbrot FILE PIXELS UPPERLEFT LOWERRIGHT")
[INFO] [stderr] 158 | |             .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:159:9
[INFO] [stderr]     |
[INFO] [stderr] 159 | /         writeln!(std::io::stderr(),
[INFO] [stderr] 160 | |                  "Example: {} mandel.png 1000x750 -1.20,0.35 -1,0.20",
[INFO] [stderr] 161 | |                  args[0])
[INFO] [stderr] 162 | |             .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: casting u32 to f64 may become silently lossy if types change
[INFO] [stderr]    --> src/main.rs:214:40
[INFO] [stderr]     |
[INFO] [stderr] 214 |                  dt.as_secs() as f64 + dt.subsec_nanos() as f64 * 1e-9);
[INFO] [stderr]     |                                        ^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(dt.subsec_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]     Finished dev [unoptimized + debuginfo] target(s) in 14.81s
[INFO] running `"docker" "inspect" "fdbf27c3e75a8a81699229c830bffa348f9685967b5792b3ad1f35bf289504c2"`
[INFO] running `"docker" "rm" "-f" "fdbf27c3e75a8a81699229c830bffa348f9685967b5792b3ad1f35bf289504c2"`
[INFO] [stdout] fdbf27c3e75a8a81699229c830bffa348f9685967b5792b3ad1f35bf289504c2