[INFO] updating cached repository DaOnlyOwner/l-Systems
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/DaOnlyOwner/l-Systems
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/DaOnlyOwner/l-Systems" "work/ex/clippy-test-run/sources/stable/gh/DaOnlyOwner/l-Systems"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/DaOnlyOwner/l-Systems'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/DaOnlyOwner/l-Systems" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/DaOnlyOwner/l-Systems"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/DaOnlyOwner/l-Systems'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 53565df1144d98b40635f36f90bda5f5de706373
[INFO] sha for GitHub repo DaOnlyOwner/l-Systems: 53565df1144d98b40635f36f90bda5f5de706373
[INFO] validating manifest of DaOnlyOwner/l-Systems 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 DaOnlyOwner/l-Systems 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 DaOnlyOwner/l-Systems
[INFO] finished frobbing DaOnlyOwner/l-Systems
[INFO] frobbed toml for DaOnlyOwner/l-Systems written to work/ex/clippy-test-run/sources/stable/gh/DaOnlyOwner/l-Systems/Cargo.toml
[INFO] started frobbing DaOnlyOwner/l-Systems
[INFO] finished frobbing DaOnlyOwner/l-Systems
[INFO] frobbed toml for DaOnlyOwner/l-Systems written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/DaOnlyOwner/l-Systems/Cargo.toml
[INFO] crate DaOnlyOwner/l-Systems 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 DaOnlyOwner/l-Systems against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-7/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/gh/DaOnlyOwner/l-Systems:/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] 779a117c5a9eafb470e9832b6b9ab78d2e75f1eda8c1d6518fc23e6167ff1d6f
[INFO] running `"docker" "start" "-a" "779a117c5a9eafb470e9832b6b9ab78d2e75f1eda8c1d6518fc23e6167ff1d6f"`
[INFO] [stderr]     Checking rayon-core v1.2.1
[INFO] [stderr]     Checking num-bigint v0.1.40
[INFO] [stderr]     Checking nalgebra v0.11.2
[INFO] [stderr]     Checking quickcheck v0.2.27
[INFO] [stderr]     Checking rayon v0.8.2
[INFO] [stderr]     Checking rayon v0.7.1
[INFO] [stderr]     Checking num-rational v0.1.39
[INFO] [stderr]     Checking num v0.1.40
[INFO] [stderr]     Checking jpeg-decoder v0.1.13
[INFO] [stderr]     Checking image v0.14.0
[INFO] [stderr]     Checking imageproc v0.9.0
[INFO] [stderr]     Checking l-systems v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/main.rs:109:43
[INFO] [stderr]     |
[INFO] [stderr] 109 |     draw("S", descr,25f32, |n| f32::round((700f32 / f32::powf(2f32,n as f32))) as u32);
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: Consider removing unnecessary double parentheses
[INFO] [stderr]    --> src/main.rs:109:43
[INFO] [stderr]     |
[INFO] [stderr] 109 |     draw("S", descr,25f32, |n| f32::round((700f32 / f32::powf(2f32,n as f32))) as u32);
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::double_parens)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `start_symbol`
[INFO] [stderr]   --> src/main.rs:70:12
[INFO] [stderr]    |
[INFO] [stderr] 70 | fn draw<F>(start_symbol : &'static str, production_rules : HashMap<&'static str, Vec<(f32,&'static str)>>, angle_degrees : f32, scaleFn : F)
[INFO] [stderr]    |            ^^^^^^^^^^^^ help: consider using `_start_symbol` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `width`
[INFO] [stderr]   --> src/main.rs:51:20
[INFO] [stderr]    |
[INFO] [stderr] 51 |     fn show(&self, width:u32, height:u32)
[INFO] [stderr]    |                    ^^^^^ help: consider using `_width` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `height`
[INFO] [stderr]   --> src/main.rs:51:31
[INFO] [stderr]    |
[INFO] [stderr] 51 |     fn show(&self, width:u32, height:u32)
[INFO] [stderr]    |                               ^^^^^^ help: consider using `_height` instead
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:36:19
[INFO] [stderr]    |
[INFO] [stderr] 36 |     pub fn length(&self) -> f32
[INFO] [stderr]    |                   ^^^^^ help: consider passing by value instead: `self`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:41:24
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub fn add(first : &Vec2d, second : &Vec2d) -> Vec2d
[INFO] [stderr]    |                        ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:41:41
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub fn add(first : &Vec2d, second : &Vec2d) -> Vec2d
[INFO] [stderr]    |                                         ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:46:24
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn sub(first : &Vec2d, second : &Vec2d) -> Vec2d
[INFO] [stderr]    |                        ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:46:41
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn sub(first : &Vec2d, second : &Vec2d) -> Vec2d
[INFO] [stderr]    |                                         ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:51:32
[INFO] [stderr]    |
[INFO] [stderr] 51 |     pub fn scalar_mult(first : &Vec2d, scalar : f32) -> Vec2d
[INFO] [stderr]    |                                ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:56:31
[INFO] [stderr]    |
[INFO] [stderr] 56 |     pub fn scalar_div(first : &Vec2d, scalar : f32) -> Vec2d
[INFO] [stderr]    |                               ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:79:37
[INFO] [stderr]    |
[INFO] [stderr] 79 |     fn draw_line(&mut self, start : &Vec2d, end : &Vec2d);
[INFO] [stderr]    |                                     ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:79:51
[INFO] [stderr]    |
[INFO] [stderr] 79 |     fn draw_line(&mut self, start : &Vec2d, end : &Vec2d);
[INFO] [stderr]    |                                                   ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]   --> src/lindenmayer.rs:43:34
[INFO] [stderr]    |
[INFO] [stderr] 43 |             let mut derivation = self.production_rules.get(&production_elem.to_string()).unwrap().clone();
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.production_rules[&production_elem.to_string()]`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/main.rs:47:13
[INFO] [stderr]    |
[INFO] [stderr] 47 |         let ref mut fout = Path::new(&filename);
[INFO] [stderr]    |         ----^^^^^^^^^^^^------------------------ help: try: `let fout = &mut Path::new(&filename);`
[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: this let-binding has unit value. Consider omitting `let _ =`
[INFO] [stderr]   --> src/main.rs:48:9
[INFO] [stderr]    |
[INFO] [stderr] 48 |         let _ = self.canvas.save(fout).unwrap();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::let_unit_value)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
[INFO] [stderr] 
[INFO] [stderr] warning: variable `scaleFn` should have a snake case name such as `scale_fn`
[INFO] [stderr]   --> src/main.rs:70:129
[INFO] [stderr]    |
[INFO] [stderr] 70 | fn draw<F>(start_symbol : &'static str, production_rules : HashMap<&'static str, Vec<(f32,&'static str)>>, angle_degrees : f32, scaleFn : F)
[INFO] [stderr]    |                                                                                                                                 ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around function argument
[INFO] [stderr]    --> src/main.rs:109:43
[INFO] [stderr]     |
[INFO] [stderr] 109 |     draw("S", descr,25f32, |n| f32::round((700f32 / f32::powf(2f32,n as f32))) as u32);
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_parens)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: Consider removing unnecessary double parentheses
[INFO] [stderr]    --> src/main.rs:109:43
[INFO] [stderr]     |
[INFO] [stderr] 109 |     draw("S", descr,25f32, |n| f32::round((700f32 / f32::powf(2f32,n as f32))) as u32);
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::double_parens)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#double_parens
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `start_symbol`
[INFO] [stderr]   --> src/main.rs:70:12
[INFO] [stderr]    |
[INFO] [stderr] 70 | fn draw<F>(start_symbol : &'static str, production_rules : HashMap<&'static str, Vec<(f32,&'static str)>>, angle_degrees : f32, scaleFn : F)
[INFO] [stderr]    |            ^^^^^^^^^^^^ help: consider using `_start_symbol` instead
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `width`
[INFO] [stderr]   --> src/main.rs:51:20
[INFO] [stderr]    |
[INFO] [stderr] 51 |     fn show(&self, width:u32, height:u32)
[INFO] [stderr]    |                    ^^^^^ help: consider using `_width` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `height`
[INFO] [stderr]   --> src/main.rs:51:31
[INFO] [stderr]    |
[INFO] [stderr] 51 |     fn show(&self, width:u32, height:u32)
[INFO] [stderr]    |                               ^^^^^^ help: consider using `_height` instead
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:36:19
[INFO] [stderr]    |
[INFO] [stderr] 36 |     pub fn length(&self) -> f32
[INFO] [stderr]    |                   ^^^^^ help: consider passing by value instead: `self`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::trivially_copy_pass_by_ref)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:41:24
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub fn add(first : &Vec2d, second : &Vec2d) -> Vec2d
[INFO] [stderr]    |                        ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:41:41
[INFO] [stderr]    |
[INFO] [stderr] 41 |     pub fn add(first : &Vec2d, second : &Vec2d) -> Vec2d
[INFO] [stderr]    |                                         ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:46:24
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn sub(first : &Vec2d, second : &Vec2d) -> Vec2d
[INFO] [stderr]    |                        ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:46:41
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn sub(first : &Vec2d, second : &Vec2d) -> Vec2d
[INFO] [stderr]    |                                         ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:51:32
[INFO] [stderr]    |
[INFO] [stderr] 51 |     pub fn scalar_mult(first : &Vec2d, scalar : f32) -> Vec2d
[INFO] [stderr]    |                                ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:56:31
[INFO] [stderr]    |
[INFO] [stderr] 56 |     pub fn scalar_div(first : &Vec2d, scalar : f32) -> Vec2d
[INFO] [stderr]    |                               ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:79:37
[INFO] [stderr]    |
[INFO] [stderr] 79 |     fn draw_line(&mut self, start : &Vec2d, end : &Vec2d);
[INFO] [stderr]    |                                     ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: this argument is passed by reference, but would be more efficient if passed by value
[INFO] [stderr]   --> src/turtle.rs:79:51
[INFO] [stderr]    |
[INFO] [stderr] 79 |     fn draw_line(&mut self, start : &Vec2d, end : &Vec2d);
[INFO] [stderr]    |                                                   ^^^^^^ help: consider passing by value instead: `Vec2d`
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#trivially_copy_pass_by_ref
[INFO] [stderr] 
[INFO] [stderr] warning: called `.get().unwrap()` on a HashMap. Using `[]` is more clear and more concise
[INFO] [stderr]   --> src/lindenmayer.rs:43:34
[INFO] [stderr]    |
[INFO] [stderr] 43 |             let mut derivation = self.production_rules.get(&production_elem.to_string()).unwrap().clone();
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&self.production_rules[&production_elem.to_string()]`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::get_unwrap)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#get_unwrap
[INFO] [stderr] 
[INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead
[INFO] [stderr]   --> src/main.rs:47:13
[INFO] [stderr]    |
[INFO] [stderr] 47 |         let ref mut fout = Path::new(&filename);
[INFO] [stderr]    |         ----^^^^^^^^^^^^------------------------ help: try: `let fout = &mut Path::new(&filename);`
[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: this let-binding has unit value. Consider omitting `let _ =`
[INFO] [stderr]   --> src/main.rs:48:9
[INFO] [stderr]    |
[INFO] [stderr] 48 |         let _ = self.canvas.save(fout).unwrap();
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::let_unit_value)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#let_unit_value
[INFO] [stderr] 
[INFO] [stderr] warning: variable `scaleFn` should have a snake case name such as `scale_fn`
[INFO] [stderr]   --> src/main.rs:70:129
[INFO] [stderr]    |
[INFO] [stderr] 70 | fn draw<F>(start_symbol : &'static str, production_rules : HashMap<&'static str, Vec<(f32,&'static str)>>, angle_degrees : f32, scaleFn : F)
[INFO] [stderr]    |                                                                                                                                 ^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(non_snake_case)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 35.74s
[INFO] running `"docker" "inspect" "779a117c5a9eafb470e9832b6b9ab78d2e75f1eda8c1d6518fc23e6167ff1d6f"`
[INFO] running `"docker" "rm" "-f" "779a117c5a9eafb470e9832b6b9ab78d2e75f1eda8c1d6518fc23e6167ff1d6f"`
[INFO] [stdout] 779a117c5a9eafb470e9832b6b9ab78d2e75f1eda8c1d6518fc23e6167ff1d6f