[INFO] crate splay 0.1.8 is already in cache
[INFO] extracting crate splay 0.1.8 into work/ex/clippy-test-run/sources/stable/reg/splay/0.1.8
[INFO] extracting crate splay 0.1.8 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/splay/0.1.8
[INFO] validating manifest of splay-0.1.8 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 splay-0.1.8 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 splay-0.1.8
[INFO] finished frobbing splay-0.1.8
[INFO] frobbed toml for splay-0.1.8 written to work/ex/clippy-test-run/sources/stable/reg/splay/0.1.8/Cargo.toml
[INFO] started frobbing splay-0.1.8
[INFO] finished frobbing splay-0.1.8
[INFO] frobbed toml for splay-0.1.8 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/splay/0.1.8/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 splay-0.1.8 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-5/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/splay/0.1.8:/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] 0874a9aeba17b1aade42176edf5b097b6431aa23e06fa4c1465144ebbf7d065e
[INFO] running `"docker" "start" "-a" "0874a9aeba17b1aade42176edf5b097b6431aa23e06fa4c1465144ebbf7d065e"`
[INFO] [stderr]     Checking splay v0.1.8 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/map.rs:176:23
[INFO] [stderr]     |
[INFO] [stderr] 176 |             None => { 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/map.rs:182:17
[INFO] [stderr]     |
[INFO] [stderr] 182 |                 return None;
[INFO] [stderr]     |                 ^^^^^^^^^^^^ help: remove `return` as shown: `None`
[INFO] [stderr]     |
[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/map.rs:219:9
[INFO] [stderr]     |
[INFO] [stderr] 219 |         return None;
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: remove `return` as shown: `None`
[INFO] [stderr]     |
[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/map.rs:250:9
[INFO] [stderr]     |
[INFO] [stderr] 250 |         return Some(value);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(value)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] warning: defining a method called `into_iter` on this type; consider implementing the `std::iter::IntoIterator` trait or choosing a less ambiguous name
[INFO] [stderr]   --> src/set.rs:21:5
[INFO] [stderr]    |
[INFO] [stderr] 21 | /     pub fn into_iter(self) -> IntoIter<T> {
[INFO] [stderr] 22 | |         IntoIter { inner: self.map.into_iter() }
[INFO] [stderr] 23 | |     }
[INFO] [stderr]    | |_____^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::should_implement_trait)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#should_implement_trait
[INFO] [stderr] 
[INFO] [stderr] warning: you seem to be trying to use `&Box<T>`. Consider using just `&T`
[INFO] [stderr]   --> src/map.rs:28:42
[INFO] [stderr]    |
[INFO] [stderr] 28 | fn splay<K, V, Q: ?Sized>(key: &Q, node: &mut Box<Node<K, V>>)
[INFO] [stderr]    |                                          ^^^^^^^^^^^^^^^^^^^^ help: try: `&mut Node<K, V>`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::borrowed_box)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#borrowed_box
[INFO] [stderr] 
[INFO] [stderr] warning: defining a method called `into_iter` on this type; consider implementing the `std::iter::IntoIterator` trait or choosing a less ambiguous name
[INFO] [stderr]    --> src/map.rs:108:5
[INFO] [stderr]     |
[INFO] [stderr] 108 | /     pub fn into_iter(mut self) -> IntoIter<K, V> {
[INFO] [stderr] 109 | |         IntoIter { cur: self.root_mut().take(), remaining: self.size }
[INFO] [stderr] 110 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#should_implement_trait
[INFO] [stderr] 
[INFO] [stderr] error: unneeded return statement
[INFO] [stderr]    --> src/map.rs:176:23
[INFO] [stderr]     |
[INFO] [stderr] 176 |             None => { return None; }
[INFO] [stderr]     |                       ^^^^^^^^^^^^ help: remove `return` as shown: `None`
[INFO] [stderr]     |
[INFO] [stderr] note: lint level defined here
[INFO] [stderr]    --> src/lib.rs:21:24
[INFO] [stderr]     |
[INFO] [stderr] 21  | #![cfg_attr(test, deny(warnings))]
[INFO] [stderr]     |                        ^^^^^^^^
[INFO] [stderr]     = note: #[deny(clippy::needless_return)] implied by #[deny(warnings)]
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] error: unneeded return statement
[INFO] [stderr]    --> src/map.rs:182:17
[INFO] [stderr]     |
[INFO] [stderr] 182 |                 return None;
[INFO] [stderr]     |                 ^^^^^^^^^^^^ help: remove `return` as shown: `None`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] error: unneeded return statement
[INFO] [stderr]    --> src/map.rs:219:9
[INFO] [stderr]     |
[INFO] [stderr] 219 |         return None;
[INFO] [stderr]     |         ^^^^^^^^^^^^ help: remove `return` as shown: `None`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] error: unneeded return statement
[INFO] [stderr]    --> src/map.rs:250:9
[INFO] [stderr]     |
[INFO] [stderr] 250 |         return Some(value);
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `Some(value)`
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `splay`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "0874a9aeba17b1aade42176edf5b097b6431aa23e06fa4c1465144ebbf7d065e"`
[INFO] running `"docker" "rm" "-f" "0874a9aeba17b1aade42176edf5b097b6431aa23e06fa4c1465144ebbf7d065e"`
[INFO] [stdout] 0874a9aeba17b1aade42176edf5b097b6431aa23e06fa4c1465144ebbf7d065e