[INFO] updating cached repository AlexABallWebDev/rust_playground
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/AlexABallWebDev/rust_playground
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/AlexABallWebDev/rust_playground" "work/ex/clippy-test-run/sources/stable/gh/AlexABallWebDev/rust_playground"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable/gh/AlexABallWebDev/rust_playground'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/AlexABallWebDev/rust_playground" "work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/AlexABallWebDev/rust_playground"`
[INFO] [stderr] Cloning into 'work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/AlexABallWebDev/rust_playground'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 1784c69f7bb2a7c150a86ea21e63bc1b73cb90dc
[INFO] sha for GitHub repo AlexABallWebDev/rust_playground: 1784c69f7bb2a7c150a86ea21e63bc1b73cb90dc
[INFO] validating manifest of AlexABallWebDev/rust_playground 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 AlexABallWebDev/rust_playground 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 AlexABallWebDev/rust_playground
[INFO] finished frobbing AlexABallWebDev/rust_playground
[INFO] frobbed toml for AlexABallWebDev/rust_playground written to work/ex/clippy-test-run/sources/stable/gh/AlexABallWebDev/rust_playground/Cargo.toml
[INFO] started frobbing AlexABallWebDev/rust_playground
[INFO] finished frobbing AlexABallWebDev/rust_playground
[INFO] frobbed toml for AlexABallWebDev/rust_playground written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/AlexABallWebDev/rust_playground/Cargo.toml
[INFO] crate AlexABallWebDev/rust_playground 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 AlexABallWebDev/rust_playground against stable+rustflags=-Dclippy::into_iter_on_array for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-4/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/gh/AlexABallWebDev/rust_playground:/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 -Dclippy::into_iter_on_array" "-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] 7e2f25a77229e2248813beaf2c24b78f3be73d9755754d2cfdd7e11d0945d970
[INFO] running `"docker" "start" "-a" "7e2f25a77229e2248813beaf2c24b78f3be73d9755754d2cfdd7e11d0945d970"`
[INFO] [stderr]     Checking rust_playground v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: All variants have the same postfix: `Key`
[INFO] [stderr]    --> src/intro_1.rs:470:5
[INFO] [stderr]     |
[INFO] [stderr] 470 | /     enum Keys {
[INFO] [stderr] 471 | |         _UpKey(String),
[INFO] [stderr] 472 | |         _DownKey(String),
[INFO] [stderr] 473 | |         _LeftKey(String),
[INFO] [stderr] 474 | |         _RightKey(String),
[INFO] [stderr] 475 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::enum_variant_names)] on by default
[INFO] [stderr]     = help: remove the postfixes and use full paths to the variants instead of glob imports
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#enum_variant_names
[INFO] [stderr] 
[INFO] [stderr] warning: All variants have the same postfix: `Key`
[INFO] [stderr]    --> src/intro_1.rs:470:5
[INFO] [stderr]     |
[INFO] [stderr] 470 | /     enum Keys {
[INFO] [stderr] 471 | |         _UpKey(String),
[INFO] [stderr] 472 | |         _DownKey(String),
[INFO] [stderr] 473 | |         _LeftKey(String),
[INFO] [stderr] 474 | |         _RightKey(String),
[INFO] [stderr] 475 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::enum_variant_names)] on by default
[INFO] [stderr]     = help: remove the postfixes and use full paths to the variants instead of glob imports
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#enum_variant_names
[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/intro_1.rs:149:30
[INFO] [stderr]     |
[INFO] [stderr] 149 |     fn borrow_dereference(v: &Vec<i32>) {
[INFO] [stderr]     |                              ^^^^^^^^^ help: change this to: `&[i32]`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/intro_1.rs:158:38
[INFO] [stderr]     |
[INFO] [stderr] 158 |     fn borrow_without_dereference(v: &Vec<i32>) {
[INFO] [stderr]     |                                      ^^^^^^^^^ help: change this to: `&[i32]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_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/intro_1.rs:173:17
[INFO] [stderr]     |
[INFO] [stderr] 173 |     fn count(v: &Vec<i32>, value: i32) -> usize {
[INFO] [stderr]     |                 ^^^^^^^^^ help: change this to: `&[i32]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/intro_1.rs:174:11
[INFO] [stderr]     |
[INFO] [stderr] 174 |         v.into_iter().filter(|&&x| x == value).count()
[INFO] [stderr]     |           ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::into_iter_on_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] warning: unused label `'c`
[INFO] [stderr]    --> src/intro_1.rs:320:13
[INFO] [stderr]     |
[INFO] [stderr] 320 | /             'c: loop {
[INFO] [stderr] 321 | |                 println!("loop c");
[INFO] [stderr] 322 | |
[INFO] [stderr] 323 | |                 if end_condition {
[INFO] [stderr] ...   |
[INFO] [stderr] 330 | |                 break 'b;
[INFO] [stderr] 331 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::unused_label)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_label
[INFO] [stderr] 
[INFO] [stderr] error: this loop never actually loops
[INFO] [stderr]    --> src/intro_1.rs:320:13
[INFO] [stderr]     |
[INFO] [stderr] 320 | /             'c: loop {
[INFO] [stderr] 321 | |                 println!("loop c");
[INFO] [stderr] 322 | |
[INFO] [stderr] 323 | |                 if end_condition {
[INFO] [stderr] ...   |
[INFO] [stderr] 330 | |                 break 'b;
[INFO] [stderr] 331 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::never_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#never_loop
[INFO] [stderr] 
[INFO] [stderr] error: this loop never actually loops
[INFO] [stderr]    --> src/intro_1.rs:342:13
[INFO] [stderr]     |
[INFO] [stderr] 342 |       let x = loop {
[INFO] [stderr]     |  _____________^
[INFO] [stderr] 343 | |         // break acts like "return" in this context.
[INFO] [stderr] 344 | |         break 10;
[INFO] [stderr] 345 | |     };
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#never_loop
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/intro_1.rs:352:9
[INFO] [stderr]     |
[INFO] [stderr] 352 |         get_to_zero = get_to_zero - 1;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `get_to_zero -= 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/intro_1.rs:510:9
[INFO] [stderr]     |
[INFO] [stderr] 510 |     let ref z = u; // z gets a reference to the 10 that u owns
[INFO] [stderr]     |     ----^^^^^----- help: try: `let z = &u;`
[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/intro_1.rs:533:53
[INFO] [stderr]     |
[INFO] [stderr] 533 |                 Shape::Rectangle {width, height} => (width * height) as f64,
[INFO] [stderr]     |                                                     ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(width * height)`
[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/intro_1.rs:534:41
[INFO] [stderr]     |
[INFO] [stderr] 534 |                 Shape::Square(ref s) => (s * s) as f64,
[INFO] [stderr]     |                                         ^^^^^^^^^^^^^^ help: try: `f64::from(s * s)`
[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] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]    --> src/intro_1.rs:535:41
[INFO] [stderr]     |
[INFO] [stderr] 535 |                 Shape::Circle(ref r) => 3.14 * (r * r),
[INFO] [stderr]     |                                         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::approx_constant)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]   --> src/main.rs:45:8
[INFO] [stderr]    |
[INFO] [stderr] 45 |       (3.141 * self.radius * self.radius) as u32
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/main.rs:74:12
[INFO] [stderr]    |
[INFO] [stderr] 74 |   let _c = _a.clone();
[INFO] [stderr]    |            ^^^^^^^^^^ help: try removing the `clone` call: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[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/intro_1.rs:149:30
[INFO] [stderr]     |
[INFO] [stderr] 149 |     fn borrow_dereference(v: &Vec<i32>) {
[INFO] [stderr]     |                              ^^^^^^^^^ help: change this to: `&[i32]`
[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: writing `&Vec<_>` instead of `&[_]` involves one more reference and cannot be used with non-Vec-based slices.
[INFO] [stderr]    --> src/intro_1.rs:158:38
[INFO] [stderr]     |
[INFO] [stderr] 158 |     fn borrow_without_dereference(v: &Vec<i32>) {
[INFO] [stderr]     |                                      ^^^^^^^^^ help: change this to: `&[i32]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_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/intro_1.rs:173:17
[INFO] [stderr]     |
[INFO] [stderr] 173 |     fn count(v: &Vec<i32>, value: i32) -> usize {
[INFO] [stderr]     |                 ^^^^^^^^^ help: change this to: `&[i32]`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#ptr_arg
[INFO] [stderr] 
[INFO] [stderr] warning: this .into_iter() call is equivalent to .iter() and will not move the Vec
[INFO] [stderr]    --> src/intro_1.rs:174:11
[INFO] [stderr]     |
[INFO] [stderr] 174 |         v.into_iter().filter(|&&x| x == value).count()
[INFO] [stderr]     |           ^^^^^^^^^ help: call directly: `iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::into_iter_on_ref)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rust_playground`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused label `'c`
[INFO] [stderr]    --> src/intro_1.rs:320:13
[INFO] [stderr]     |
[INFO] [stderr] 320 | /             'c: loop {
[INFO] [stderr] 321 | |                 println!("loop c");
[INFO] [stderr] 322 | |
[INFO] [stderr] 323 | |                 if end_condition {
[INFO] [stderr] ...   |
[INFO] [stderr] 330 | |                 break 'b;
[INFO] [stderr] 331 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(clippy::unused_label)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_label
[INFO] [stderr] 
[INFO] [stderr] error: this loop never actually loops
[INFO] [stderr]    --> src/intro_1.rs:320:13
[INFO] [stderr]     |
[INFO] [stderr] 320 | /             'c: loop {
[INFO] [stderr] 321 | |                 println!("loop c");
[INFO] [stderr] 322 | |
[INFO] [stderr] 323 | |                 if end_condition {
[INFO] [stderr] ...   |
[INFO] [stderr] 330 | |                 break 'b;
[INFO] [stderr] 331 | |             }
[INFO] [stderr]     | |_____________^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::never_loop)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#never_loop
[INFO] [stderr] 
[INFO] [stderr] error: this loop never actually loops
[INFO] [stderr]    --> src/intro_1.rs:342:13
[INFO] [stderr]     |
[INFO] [stderr] 342 |       let x = loop {
[INFO] [stderr]     |  _____________^
[INFO] [stderr] 343 | |         // break acts like "return" in this context.
[INFO] [stderr] 344 | |         break 10;
[INFO] [stderr] 345 | |     };
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#never_loop
[INFO] [stderr] 
[INFO] [stderr] warning: manual implementation of an assign operation
[INFO] [stderr]    --> src/intro_1.rs:352:9
[INFO] [stderr]     |
[INFO] [stderr] 352 |         get_to_zero = get_to_zero - 1;
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace it with: `get_to_zero -= 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/intro_1.rs:510:9
[INFO] [stderr]     |
[INFO] [stderr] 510 |     let ref z = u; // z gets a reference to the 10 that u owns
[INFO] [stderr]     |     ----^^^^^----- help: try: `let z = &u;`
[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/intro_1.rs:533:53
[INFO] [stderr]     |
[INFO] [stderr] 533 |                 Shape::Rectangle {width, height} => (width * height) as f64,
[INFO] [stderr]     |                                                     ^^^^^^^^^^^^^^^^^^^^^^^ help: try: `f64::from(width * height)`
[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/intro_1.rs:534:41
[INFO] [stderr]     |
[INFO] [stderr] 534 |                 Shape::Square(ref s) => (s * s) as f64,
[INFO] [stderr]     |                                         ^^^^^^^^^^^^^^ help: try: `f64::from(s * s)`
[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] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]    --> src/intro_1.rs:535:41
[INFO] [stderr]     |
[INFO] [stderr] 535 |                 Shape::Circle(ref r) => 3.14 * (r * r),
[INFO] [stderr]     |                                         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[deny(clippy::approx_constant)] on by default
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] error: approximate value of `f{32, 64}::consts::PI` found. Consider using it directly
[INFO] [stderr]   --> src/main.rs:45:8
[INFO] [stderr]    |
[INFO] [stderr] 45 |       (3.141 * self.radius * self.radius) as u32
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#approx_constant
[INFO] [stderr] 
[INFO] [stderr] warning: using `clone` on a `Copy` type
[INFO] [stderr]   --> src/main.rs:74:12
[INFO] [stderr]    |
[INFO] [stderr] 74 |   let _c = _a.clone();
[INFO] [stderr]    |            ^^^^^^^^^^ help: try removing the `clone` call: `_a`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::clone_on_copy)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#clone_on_copy
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `rust_playground`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7e2f25a77229e2248813beaf2c24b78f3be73d9755754d2cfdd7e11d0945d970"`
[INFO] running `"docker" "rm" "-f" "7e2f25a77229e2248813beaf2c24b78f3be73d9755754d2cfdd7e11d0945d970"`
[INFO] [stdout] 7e2f25a77229e2248813beaf2c24b78f3be73d9755754d2cfdd7e11d0945d970