[INFO] updating cached repository aktzk/sph_rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/aktzk/sph_rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/aktzk/sph_rs" "work/ex/clippy-test-run/sources/stable/gh/aktzk/sph_rs"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/aktzk/sph_rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/aktzk/sph_rs" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/aktzk/sph_rs"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/aktzk/sph_rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3c58b4814379c2083e8a94172e1ddc523c88476d
[INFO] sha for GitHub repo aktzk/sph_rs: 3c58b4814379c2083e8a94172e1ddc523c88476d
[INFO] validating manifest of aktzk/sph_rs 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 aktzk/sph_rs 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 aktzk/sph_rs
[INFO] finished frobbing aktzk/sph_rs
[INFO] frobbed toml for aktzk/sph_rs written to work/ex/clippy-test-run/sources/stable/gh/aktzk/sph_rs/Cargo.toml
[INFO] started frobbing aktzk/sph_rs
[INFO] finished frobbing aktzk/sph_rs
[INFO] frobbed toml for aktzk/sph_rs written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/aktzk/sph_rs/Cargo.toml
[INFO] crate aktzk/sph_rs 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 aktzk/sph_rs against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-3/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/aktzk/sph_rs:/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] 37e9d1329e4ea1a3abc85a07a1c4db8ff6a0b3b6aa7151d38e65c3148415fa9e
[INFO] running `"docker" "start" "-a" "37e9d1329e4ea1a3abc85a07a1c4db8ff6a0b3b6aa7151d38e65c3148415fa9e"`
[INFO] [stderr]     Checking cgmath v0.14.1
[INFO] [stderr]     Checking gfx_core v0.5.1
[INFO] [stderr]     Checking png v0.6.2
[INFO] [stderr]     Checking pistoncore-event_loop v0.27.0
[INFO] [stderr]     Checking pistoncore-glutin_window v0.33.0
[INFO] [stderr]     Checking piston v0.27.0
[INFO] [stderr]     Checking image v0.12.4
[INFO] [stderr]     Checking gfx v0.13.0
[INFO] [stderr]     Checking gfx_device_gl v0.12.0
[INFO] [stderr]     Checking piston-gfx_texture v0.20.0
[INFO] [stderr]     Checking piston2d-gfx_graphics v0.35.0
[INFO] [stderr]     Checking piston_window v0.61.0
[INFO] [stderr]     Checking sph_rs v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/particle.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |             position: position,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^ help: replace it with: `position`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/particle.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |             mass: mass,
[INFO] [stderr]    |             ^^^^^^^^^^ help: replace it with: `mass`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/sph.rs:32:13
[INFO] [stderr]    |
[INFO] [stderr] 32 |             particles: particles,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^ help: replace it with: `particles`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/sph.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |             grid: grid,
[INFO] [stderr]    |             ^^^^^^^^^^ help: replace it with: `grid`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/sph_renderer.rs:21:13
[INFO] [stderr]    |
[INFO] [stderr] 21 |             window: window,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^ help: replace it with: `window`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/particle.rs:15:13
[INFO] [stderr]    |
[INFO] [stderr] 15 |             position: position,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^ help: replace it with: `position`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::redundant_field_names)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/particle.rs:18:13
[INFO] [stderr]    |
[INFO] [stderr] 18 |             mass: mass,
[INFO] [stderr]    |             ^^^^^^^^^^ help: replace it with: `mass`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/sph.rs:32:13
[INFO] [stderr]    |
[INFO] [stderr] 32 |             particles: particles,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^^^^^ help: replace it with: `particles`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/sph.rs:34:13
[INFO] [stderr]    |
[INFO] [stderr] 34 |             grid: grid,
[INFO] [stderr]    |             ^^^^^^^^^^ help: replace it with: `grid`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: redundant field names in struct initialization
[INFO] [stderr]   --> src/sph_renderer.rs:21:13
[INFO] [stderr]    |
[INFO] [stderr] 21 |             window: window,
[INFO] [stderr]    |             ^^^^^^^^^^^^^^ help: replace it with: `window`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_field_names
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |         self.position = self.position  +  self.velocity * (damp - 1.0) * bounce;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.position += self.velocity * (damp - 1.0) * bounce`
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 |         self.velocity.x = -1.0 * self.velocity.x;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.velocity.x *= -1.0`
[INFO] [stderr]    |
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |         self.velocity = self.velocity * damp;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.velocity *= damp`
[INFO] [stderr]    |
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         self.position =self.position + self.velocity * (damp - 1.0) * bounce;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.position += self.velocity * (damp - 1.0) * bounce`
[INFO] [stderr]    |
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:67:9
[INFO] [stderr]    |
[INFO] [stderr] 67 |         self.velocity.y = -1.0 * self.velocity.y;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.velocity.y *= -1.0`
[INFO] [stderr]    |
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 |         self.velocity = self.velocity * damp;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.velocity *= damp`
[INFO] [stderr]    |
[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/sph.rs:74:17
[INFO] [stderr]    |
[INFO] [stderr] 74 |             let ref neighbors = self.neighborhoods[i];
[INFO] [stderr]    |             ----^^^^^^^^^^^^^------------------------- help: try: `let neighbors = &self.neighborhoods[i];`
[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: the loop variable `n` is only used to index `neighbors`.
[INFO] [stderr]   --> src/sph.rs:76:22
[INFO] [stderr]    |
[INFO] [stderr] 76 |             for n in 0..neighbors.len() {
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]    |
[INFO] [stderr] 76 |             for <item> in &neighbors {
[INFO] [stderr]    |                 ^^^^^^    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/sph.rs:96:17
[INFO] [stderr]    |
[INFO] [stderr] 96 |             let ref neighbors = self.neighborhoods[i];
[INFO] [stderr]    |             ----^^^^^^^^^^^^^------------------------- help: try: `let neighbors = &self.neighborhoods[i];`
[INFO] [stderr]    |
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/grid.rs:30:41
[INFO] [stderr]    |
[INFO] [stderr] 30 |     pub fn update(&mut self, particles: &Vec<Particle>) {
[INFO] [stderr]    |                                         ^^^^^^^^^^^^^^ help: change this to: `&[Particle]`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `i` is used to index `particles`
[INFO] [stderr]   --> src/grid.rs:32:18
[INFO] [stderr]    |
[INFO] [stderr] 32 |         for i in 0..particles.len() {
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]    |
[INFO] [stderr] 32 |         for (i, <item>) in particles.iter().enumerate() {
[INFO] [stderr]    |             ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/grid.rs:33:17
[INFO] [stderr]    |
[INFO] [stderr] 33 |             let ref p = particles[i];
[INFO] [stderr]    |             ----^^^^^---------------- help: try: `let p = &particles[i];`
[INFO] [stderr]    |
[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: use of `or_insert` followed by a function call
[INFO] [stderr]   --> src/grid.rs:35:62
[INFO] [stderr]    |
[INFO] [stderr] 35 |             self.cells.entry((cell.x as i64, cell.y as i64)).or_insert(Vec::new()).push(i);
[INFO] [stderr]    |                                                              ^^^^^^^^^^^^^^^^^^^^^ help: try this: `or_insert_with(Vec::new)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::or_fun_call)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#or_fun_call
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:53:9
[INFO] [stderr]    |
[INFO] [stderr] 53 |         self.position = self.position  +  self.velocity * (damp - 1.0) * bounce;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.position += self.velocity * (damp - 1.0) * bounce`
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:55:9
[INFO] [stderr]    |
[INFO] [stderr] 55 |         self.velocity.x = -1.0 * self.velocity.x;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.velocity.x *= -1.0`
[INFO] [stderr]    |
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |         self.velocity = self.velocity * damp;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.velocity *= damp`
[INFO] [stderr]    |
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:65:9
[INFO] [stderr]    |
[INFO] [stderr] 65 |         self.position =self.position + self.velocity * (damp - 1.0) * bounce;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.position += self.velocity * (damp - 1.0) * bounce`
[INFO] [stderr]    |
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:67:9
[INFO] [stderr]    |
[INFO] [stderr] 67 |         self.velocity.y = -1.0 * self.velocity.y;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.velocity.y *= -1.0`
[INFO] [stderr]    |
[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: manual implementation of an assign operation
[INFO] [stderr]   --> src/particle.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 |         self.velocity = self.velocity * damp;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `self.velocity *= damp`
[INFO] [stderr]    |
[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/sph.rs:74:17
[INFO] [stderr]    |
[INFO] [stderr] 74 |             let ref neighbors = self.neighborhoods[i];
[INFO] [stderr]    |             ----^^^^^^^^^^^^^------------------------- help: try: `let neighbors = &self.neighborhoods[i];`
[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: the loop variable `n` is only used to index `neighbors`.
[INFO] [stderr]   --> src/sph.rs:76:22
[INFO] [stderr]    |
[INFO] [stderr] 76 |             for n in 0..neighbors.len() {
[INFO] [stderr]    |                      ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::needless_range_loop)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]    |
[INFO] [stderr] 76 |             for <item> in &neighbors {
[INFO] [stderr]    |                 ^^^^^^    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/sph.rs:96:17
[INFO] [stderr]    |
[INFO] [stderr] 96 |             let ref neighbors = self.neighborhoods[i];
[INFO] [stderr]    |             ----^^^^^^^^^^^^^------------------------- help: try: `let neighbors = &self.neighborhoods[i];`
[INFO] [stderr]    |
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]   --> src/grid.rs:30:41
[INFO] [stderr]    |
[INFO] [stderr] 30 |     pub fn update(&mut self, particles: &Vec<Particle>) {
[INFO] [stderr]    |                                         ^^^^^^^^^^^^^^ help: change this to: `&[Particle]`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::ptr_arg)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: the loop variable `i` is used to index `particles`
[INFO] [stderr]   --> src/grid.rs:32:18
[INFO] [stderr]    |
[INFO] [stderr] 32 |         for i in 0..particles.len() {
[INFO] [stderr]    |                  ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_range_loop
[INFO] [stderr] help: consider using an iterator
[INFO] [stderr]    |
[INFO] [stderr] 32 |         for (i, <item>) in particles.iter().enumerate() {
[INFO] [stderr]    |             ^^^^^^^^^^^    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/grid.rs:33:17
[INFO] [stderr]    |
[INFO] [stderr] 33 |             let ref p = particles[i];
[INFO] [stderr]    |             ----^^^^^---------------- help: try: `let p = &particles[i];`
[INFO] [stderr]    |
[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: use of `or_insert` followed by a function call
[INFO] [stderr]   --> src/grid.rs:35:62
[INFO] [stderr]    |
[INFO] [stderr] 35 |             self.cells.entry((cell.x as i64, cell.y as i64)).or_insert(Vec::new()).push(i);
[INFO] [stderr]    |                                                              ^^^^^^^^^^^^^^^^^^^^^ help: try this: `or_insert_with(Vec::new)`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::or_fun_call)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#or_fun_call
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 43.86s
[INFO] running `"docker" "inspect" "37e9d1329e4ea1a3abc85a07a1c4db8ff6a0b3b6aa7151d38e65c3148415fa9e"`
[INFO] running `"docker" "rm" "-f" "37e9d1329e4ea1a3abc85a07a1c4db8ff6a0b3b6aa7151d38e65c3148415fa9e"`
[INFO] [stdout] 37e9d1329e4ea1a3abc85a07a1c4db8ff6a0b3b6aa7151d38e65c3148415fa9e