[INFO] crate shawshank 0.2.3 is already in cache [INFO] extracting crate shawshank 0.2.3 into work/ex/clippy-test-run/sources/stable/reg/shawshank/0.2.3 [INFO] extracting crate shawshank 0.2.3 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/shawshank/0.2.3 [INFO] validating manifest of shawshank-0.2.3 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 shawshank-0.2.3 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 shawshank-0.2.3 [INFO] finished frobbing shawshank-0.2.3 [INFO] frobbed toml for shawshank-0.2.3 written to work/ex/clippy-test-run/sources/stable/reg/shawshank/0.2.3/Cargo.toml [INFO] started frobbing shawshank-0.2.3 [INFO] finished frobbing shawshank-0.2.3 [INFO] frobbed toml for shawshank-0.2.3 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/shawshank/0.2.3/Cargo.toml [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+stable" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` [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 shawshank-0.2.3 against stable for clippy-test-run [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-4/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/shawshank/0.2.3:/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] 7ecb6aac36bae80d590062e0e36c3326d3238d69168a42a019b6ba982d56b0dc [INFO] running `"docker" "start" "-a" "7ecb6aac36bae80d590062e0e36c3326d3238d69168a42a019b6ba982d56b0dc"` [INFO] [stderr] Checking shawshank v0.2.3 (/opt/crater/workdir) [INFO] [stderr] warning: redundant field names in struct initialization [INFO] [stderr] --> src/arena_set.rs:139:13 [INFO] [stderr] | [INFO] [stderr] 139 | max_idx: max_idx, [INFO] [stderr] | ^^^^^^^^^^^^^^^^ help: replace it with: `max_idx` [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/arena_set.rs:139:13 [INFO] [stderr] | [INFO] [stderr] 139 | max_idx: max_idx, [INFO] [stderr] | ^^^^^^^^^^^^^^^^ help: replace it with: `max_idx` [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: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration) [INFO] [stderr] --> src/arena_set.rs:182:5 [INFO] [stderr] | [INFO] [stderr] 182 | / pub fn resolve<'a, U, Q: ? Sized>(&'a self, id: U) -> Result<&'a Q, Error> [INFO] [stderr] 183 | | where U: Borrow, [INFO] [stderr] 184 | | O: Borrow { [INFO] [stderr] 185 | | let ix = id.borrow().to_usize().ok_or(Error::FromIdFailed)?; [INFO] [stderr] ... | [INFO] [stderr] 190 | | } [INFO] [stderr] 191 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::needless_lifetimes)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes [INFO] [stderr] [INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration) [INFO] [stderr] --> src/arena_set.rs:342:5 [INFO] [stderr] | [INFO] [stderr] 342 | / pub fn disintern<'a, U: Borrow>(&'a mut self, id: U) -> Result { [INFO] [stderr] 343 | | disintern!(self, id) [INFO] [stderr] 344 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes [INFO] [stderr] [INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead [INFO] [stderr] --> src/arena_set.rs:408:13 [INFO] [stderr] | [INFO] [stderr] 408 | let ref mut this = self.0; [INFO] [stderr] | ----^^^^^^^^^^^^---------- help: try: `let this = &mut self.0;` [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: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration) [INFO] [stderr] --> src/arena_set.rs:425:5 [INFO] [stderr] | [INFO] [stderr] 425 | / pub fn disintern<'a, U: Borrow>(&'a mut self, id: U) -> Result { [INFO] [stderr] 426 | | let ref mut this = self.0; [INFO] [stderr] 427 | | disintern!(this, id) [INFO] [stderr] 428 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes [INFO] [stderr] [INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead [INFO] [stderr] --> src/arena_set.rs:426:13 [INFO] [stderr] | [INFO] [stderr] 426 | let ref mut this = self.0; [INFO] [stderr] | ----^^^^^^^^^^^^---------- help: try: `let this = &mut self.0;` [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: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration) [INFO] [stderr] --> src/arena_set.rs:444:5 [INFO] [stderr] | [INFO] [stderr] 444 | / pub fn resolve<'a, U, Q: ? Sized>(&'a self, id: U) -> Result<&'a Q, Error> [INFO] [stderr] 445 | | where U: Borrow, [INFO] [stderr] 446 | | O: Borrow { [INFO] [stderr] 447 | | self.0.resolve(id) [INFO] [stderr] 448 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes [INFO] [stderr] [INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead [INFO] [stderr] --> src/arena_set.rs:455:13 [INFO] [stderr] | [INFO] [stderr] 455 | let ref mut this = self.0; [INFO] [stderr] | ----^^^^^^^^^^^^---------- help: try: `let this = &mut self.0;` [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: you should consider deriving a `Default` implementation for `builder::Builder` [INFO] [stderr] --> src/builder.rs:35:5 [INFO] [stderr] | [INFO] [stderr] 35 | / pub fn new() -> Self { [INFO] [stderr] 36 | | Builder { [INFO] [stderr] 37 | | _o: PhantomData, [INFO] [stderr] 38 | | _i: PhantomData, [INFO] [stderr] 39 | | } [INFO] [stderr] 40 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::new_without_default_derive)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive [INFO] [stderr] help: try this [INFO] [stderr] | [INFO] [stderr] 29 | #[derive(Default)] [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions [INFO] [stderr] --> src/builder.rs:55:27 [INFO] [stderr] | [INFO] [stderr] 55 | pub fn hash(&self) -> Result>, Error> [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::type_complexity)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity [INFO] [stderr] [INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions [INFO] [stderr] --> src/builder.rs:62:28 [INFO] [stderr] | [INFO] [stderr] 62 | pub fn btree(&self) -> Result>, Error> [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity [INFO] [stderr] [INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions [INFO] [stderr] --> src/builder.rs:76:39 [INFO] [stderr] | [INFO] [stderr] 76 | pub fn stadium_set_hash(&self) -> Result::Target, I>>, Error> [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity [INFO] [stderr] [INFO] [stderr] warning: redundant closure found [INFO] [stderr] --> src/builder.rs:78:29 [INFO] [stderr] | [INFO] [stderr] 78 | ArenaSet::new().map(|p| StadiumSet(p)) [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ help: remove closure as shown: `StadiumSet` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::redundant_closure)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure [INFO] [stderr] [INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions [INFO] [stderr] --> src/builder.rs:83:40 [INFO] [stderr] | [INFO] [stderr] 83 | pub fn stadium_set_btree(&self) -> Result::Target, I>>, Error> [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity [INFO] [stderr] [INFO] [stderr] warning: redundant closure found [INFO] [stderr] --> src/builder.rs:85:29 [INFO] [stderr] | [INFO] [stderr] 85 | ArenaSet::new().map(|p| StadiumSet(p)) [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ help: remove closure as shown: `StadiumSet` [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure [INFO] [stderr] [INFO] [stderr] warning: trait `Map` has a `len` method but no (possibly inherited) `is_empty` method [INFO] [stderr] --> src/traits.rs:12:1 [INFO] [stderr] | [INFO] [stderr] 12 | / pub trait Map { [INFO] [stderr] 13 | | type Key; [INFO] [stderr] 14 | | type Value; [INFO] [stderr] 15 | | [INFO] [stderr] ... | [INFO] [stderr] 49 | | fn shrink_to_fit(&mut self); [INFO] [stderr] 50 | | } [INFO] [stderr] | |_^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::len_without_is_empty)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty [INFO] [stderr] [INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration) [INFO] [stderr] --> src/arena_set.rs:182:5 [INFO] [stderr] | [INFO] [stderr] 182 | / pub fn resolve<'a, U, Q: ? Sized>(&'a self, id: U) -> Result<&'a Q, Error> [INFO] [stderr] 183 | | where U: Borrow, [INFO] [stderr] 184 | | O: Borrow { [INFO] [stderr] 185 | | let ix = id.borrow().to_usize().ok_or(Error::FromIdFailed)?; [INFO] [stderr] ... | [INFO] [stderr] 190 | | } [INFO] [stderr] 191 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::needless_lifetimes)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes [INFO] [stderr] [INFO] [stderr] warning: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration) [INFO] [stderr] --> src/arena_set.rs:342:5 [INFO] [stderr] | [INFO] [stderr] 342 | / pub fn disintern<'a, U: Borrow>(&'a mut self, id: U) -> Result { [INFO] [stderr] 343 | | disintern!(self, id) [INFO] [stderr] 344 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes [INFO] [stderr] [INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead [INFO] [stderr] --> src/arena_set.rs:408:13 [INFO] [stderr] | [INFO] [stderr] 408 | let ref mut this = self.0; [INFO] [stderr] | ----^^^^^^^^^^^^---------- help: try: `let this = &mut self.0;` [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: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration) [INFO] [stderr] --> src/arena_set.rs:425:5 [INFO] [stderr] | [INFO] [stderr] 425 | / pub fn disintern<'a, U: Borrow>(&'a mut self, id: U) -> Result { [INFO] [stderr] 426 | | let ref mut this = self.0; [INFO] [stderr] 427 | | disintern!(this, id) [INFO] [stderr] 428 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes [INFO] [stderr] [INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead [INFO] [stderr] --> src/arena_set.rs:426:13 [INFO] [stderr] | [INFO] [stderr] 426 | let ref mut this = self.0; [INFO] [stderr] | ----^^^^^^^^^^^^---------- help: try: `let this = &mut self.0;` [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: explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration) [INFO] [stderr] --> src/arena_set.rs:444:5 [INFO] [stderr] | [INFO] [stderr] 444 | / pub fn resolve<'a, U, Q: ? Sized>(&'a self, id: U) -> Result<&'a Q, Error> [INFO] [stderr] 445 | | where U: Borrow, [INFO] [stderr] 446 | | O: Borrow { [INFO] [stderr] 447 | | self.0.resolve(id) [INFO] [stderr] 448 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes [INFO] [stderr] [INFO] [stderr] warning: `ref` on an entire `let` pattern is discouraged, take a reference with `&` instead [INFO] [stderr] --> src/arena_set.rs:455:13 [INFO] [stderr] | [INFO] [stderr] 455 | let ref mut this = self.0; [INFO] [stderr] | ----^^^^^^^^^^^^---------- help: try: `let this = &mut self.0;` [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: you should consider deriving a `Default` implementation for `builder::Builder` [INFO] [stderr] --> src/builder.rs:35:5 [INFO] [stderr] | [INFO] [stderr] 35 | / pub fn new() -> Self { [INFO] [stderr] 36 | | Builder { [INFO] [stderr] 37 | | _o: PhantomData, [INFO] [stderr] 38 | | _i: PhantomData, [INFO] [stderr] 39 | | } [INFO] [stderr] 40 | | } [INFO] [stderr] | |_____^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::new_without_default_derive)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#new_without_default_derive [INFO] [stderr] help: try this [INFO] [stderr] | [INFO] [stderr] 29 | #[derive(Default)] [INFO] [stderr] | [INFO] [stderr] [INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions [INFO] [stderr] --> src/builder.rs:55:27 [INFO] [stderr] | [INFO] [stderr] 55 | pub fn hash(&self) -> Result>, Error> [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::type_complexity)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity [INFO] [stderr] [INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions [INFO] [stderr] --> src/builder.rs:62:28 [INFO] [stderr] | [INFO] [stderr] 62 | pub fn btree(&self) -> Result>, Error> [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity [INFO] [stderr] [INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions [INFO] [stderr] --> src/builder.rs:76:39 [INFO] [stderr] | [INFO] [stderr] 76 | pub fn stadium_set_hash(&self) -> Result::Target, I>>, Error> [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity [INFO] [stderr] [INFO] [stderr] warning: redundant closure found [INFO] [stderr] --> src/builder.rs:78:29 [INFO] [stderr] | [INFO] [stderr] 78 | ArenaSet::new().map(|p| StadiumSet(p)) [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ help: remove closure as shown: `StadiumSet` [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::redundant_closure)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure [INFO] [stderr] [INFO] [stderr] warning: very complex type used. Consider factoring parts into `type` definitions [INFO] [stderr] --> src/builder.rs:83:40 [INFO] [stderr] | [INFO] [stderr] 83 | pub fn stadium_set_btree(&self) -> Result::Target, I>>, Error> [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity [INFO] [stderr] [INFO] [stderr] warning: redundant closure found [INFO] [stderr] --> src/builder.rs:85:29 [INFO] [stderr] | [INFO] [stderr] 85 | ArenaSet::new().map(|p| StadiumSet(p)) [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ help: remove closure as shown: `StadiumSet` [INFO] [stderr] | [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_closure [INFO] [stderr] [INFO] [stderr] warning: trait `Map` has a `len` method but no (possibly inherited) `is_empty` method [INFO] [stderr] --> src/traits.rs:12:1 [INFO] [stderr] | [INFO] [stderr] 12 | / pub trait Map { [INFO] [stderr] 13 | | type Key; [INFO] [stderr] 14 | | type Value; [INFO] [stderr] 15 | | [INFO] [stderr] ... | [INFO] [stderr] 49 | | fn shrink_to_fit(&mut self); [INFO] [stderr] 50 | | } [INFO] [stderr] | |_^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(clippy::len_without_is_empty)] on by default [INFO] [stderr] = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#len_without_is_empty [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 1.25s [INFO] running `"docker" "inspect" "7ecb6aac36bae80d590062e0e36c3326d3238d69168a42a019b6ba982d56b0dc"` [INFO] running `"docker" "rm" "-f" "7ecb6aac36bae80d590062e0e36c3326d3238d69168a42a019b6ba982d56b0dc"` [INFO] [stdout] 7ecb6aac36bae80d590062e0e36c3326d3238d69168a42a019b6ba982d56b0dc