[INFO] crate futures-locks 0.3.0 is already in cache
[INFO] extracting crate futures-locks 0.3.0 into work/ex/clippy-test-run/sources/stable/reg/futures-locks/0.3.0
[INFO] extracting crate futures-locks 0.3.0 into work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/futures-locks/0.3.0
[INFO] validating manifest of futures-locks-0.3.0 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 futures-locks-0.3.0 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 futures-locks-0.3.0
[INFO] removed 0 missing tests
[INFO] finished frobbing futures-locks-0.3.0
[INFO] frobbed toml for futures-locks-0.3.0 written to work/ex/clippy-test-run/sources/stable/reg/futures-locks/0.3.0/Cargo.toml
[INFO] started frobbing futures-locks-0.3.0
[INFO] removed 0 missing tests
[INFO] finished frobbing futures-locks-0.3.0
[INFO] frobbed toml for futures-locks-0.3.0 written to work/ex/clippy-test-run/sources/stable+rustflags=-Dclippy%3A%3Ainto_iter_on_array/reg/futures-locks/0.3.0/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 futures-locks-0.3.0 against stable for clippy-test-run
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/clippy-test-run/worker-2/stable:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/clippy-test-run/sources/stable/reg/futures-locks/0.3.0:/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] c094e42a0531ead934440ccce417bec176e5f5d442827bc7248f45dd10e0303b
[INFO] running `"docker" "start" "-a" "c094e42a0531ead934440ccce417bec176e5f5d442827bc7248f45dd10e0303b"`
[INFO] [stderr]     Checking futures-locks v0.3.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/rwlock.rs:376:9
[INFO] [stderr]     |
[INFO] [stderr] 376 |         return RwLockReadFut::new(FutState::New, self.clone())
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `RwLockReadFut::new(FutState::New, self.clone())`
[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/rwlock.rs:401:9
[INFO] [stderr]     |
[INFO] [stderr] 401 |         return RwLockWriteFut::new(FutState::New, self.clone())
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `RwLockWriteFut::new(FutState::New, self.clone())`
[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: use of deprecated item 'tokio::executor::current_thread': use tokio-current-thread crate or functions in tokio::runtime::current_thread instead
[INFO] [stderr]   --> src/mutex.rs:15:31
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[cfg(feature = "tokio")] use tokio::executor::current_thread;
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'tokio::executor::current_thread': use tokio-current-thread crate or functions in tokio::runtime::current_thread instead
[INFO] [stderr]   --> src/rwlock.rs:15:31
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[cfg(feature = "tokio")] use tokio::executor::current_thread;
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unneeded return statement
[INFO] [stderr]    --> src/rwlock.rs:376:9
[INFO] [stderr]     |
[INFO] [stderr] 376 |         return RwLockReadFut::new(FutState::New, self.clone())
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `RwLockReadFut::new(FutState::New, self.clone())`
[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/rwlock.rs:401:9
[INFO] [stderr]     |
[INFO] [stderr] 401 |         return RwLockWriteFut::new(FutState::New, self.clone())
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove `return` as shown: `RwLockWriteFut::new(FutState::New, self.clone())`
[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: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/mutex.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 | /         match &mut self.state {
[INFO] [stderr] 58 | |             &mut FutState::New => {
[INFO] [stderr] 59 | |                 // Mutex hasn't yet been modified; nothing to do
[INFO] [stderr] 60 | |             },
[INFO] [stderr] ...  |
[INFO] [stderr] 84 | |             }
[INFO] [stderr] 85 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 57 |         match *(&mut self.state) {
[INFO] [stderr] 58 |             FutState::New => {
[INFO] [stderr] 59 |                 // Mutex hasn't yet been modified; nothing to do
[INFO] [stderr] 60 |             },
[INFO] [stderr] 61 |             FutState::Pending(ref mut rx) => {
[INFO] [stderr] 62 |                 rx.close();
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/mutex.rs:94:35
[INFO] [stderr]     |
[INFO] [stderr] 94  |           let (result, new_state) = match &mut self.state {
[INFO] [stderr]     |  ___________________________________^
[INFO] [stderr] 95  | |             &mut FutState::New => {
[INFO] [stderr] 96  | |                 let mut mtx_data = self.mutex.inner.mutex.lock()
[INFO] [stderr] 97  | |                     .expect("sync::Mutex::lock");
[INFO] [stderr] ...   |
[INFO] [stderr] 127 | |             &mut FutState::Acquired => panic!("Double-poll of ready Future")
[INFO] [stderr] 128 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 94  |         let (result, new_state) = match *(&mut self.state) {
[INFO] [stderr] 95  |             FutState::New => {
[INFO] [stderr] 96  |                 let mut mtx_data = self.mutex.inner.mutex.lock()
[INFO] [stderr] 97  |                     .expect("sync::Mutex::lock");
[INFO] [stderr] 98  |                 if mtx_data.owned {
[INFO] [stderr] 99  |                     let (tx, mut rx) = oneshot::channel::<()>();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'tokio::executor::current_thread': use tokio-current-thread crate or functions in tokio::runtime::current_thread instead
[INFO] [stderr]   --> src/mutex.rs:15:31
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[cfg(feature = "tokio")] use tokio::executor::current_thread;
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'tokio::executor::current_thread': use tokio-current-thread crate or functions in tokio::runtime::current_thread instead
[INFO] [stderr]   --> src/rwlock.rs:15:31
[INFO] [stderr]    |
[INFO] [stderr] 15 | #[cfg(feature = "tokio")] use tokio::executor::current_thread;
[INFO] [stderr]    |                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/rwlock.rs:77:9
[INFO] [stderr]     |
[INFO] [stderr] 77  | /         match &mut self.state {
[INFO] [stderr] 78  | |             &mut FutState::New => {
[INFO] [stderr] 79  | |                 // RwLock hasn't yet been modified; nothing to do
[INFO] [stderr] 80  | |             },
[INFO] [stderr] ...   |
[INFO] [stderr] 104 | |             }
[INFO] [stderr] 105 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 77  |         match *(&mut self.state) {
[INFO] [stderr] 78  |             FutState::New => {
[INFO] [stderr] 79  |                 // RwLock hasn't yet been modified; nothing to do
[INFO] [stderr] 80  |             },
[INFO] [stderr] 81  |             FutState::Pending(ref mut rx) => {
[INFO] [stderr] 82  |                 rx.close();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/rwlock.rs:114:35
[INFO] [stderr]     |
[INFO] [stderr] 114 |           let (result, new_state) = match &mut self.state {
[INFO] [stderr]     |  ___________________________________^
[INFO] [stderr] 115 | |             &mut FutState::New => {
[INFO] [stderr] 116 | |                 let mut lock_data = self.rwlock.inner.mutex.lock()
[INFO] [stderr] 117 | |                     .expect("sync::Mutex::lock");
[INFO] [stderr] ...   |
[INFO] [stderr] 147 | |             &mut FutState::Acquired => panic!("Double-poll of ready Future")
[INFO] [stderr] 148 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 114 |         let (result, new_state) = match *(&mut self.state) {
[INFO] [stderr] 115 |             FutState::New => {
[INFO] [stderr] 116 |                 let mut lock_data = self.rwlock.inner.mutex.lock()
[INFO] [stderr] 117 |                     .expect("sync::Mutex::lock");
[INFO] [stderr] 118 |                 if lock_data.exclusive {
[INFO] [stderr] 119 |                     let (tx, mut rx) = oneshot::channel::<()>();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/rwlock.rs:168:9
[INFO] [stderr]     |
[INFO] [stderr] 168 | /         match &mut self.state {
[INFO] [stderr] 169 | |             &mut FutState::New => {
[INFO] [stderr] 170 | |                 // RwLock hasn't yet been modified; nothing to do
[INFO] [stderr] 171 | |             },
[INFO] [stderr] ...   |
[INFO] [stderr] 195 | |             }
[INFO] [stderr] 196 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 168 |         match *(&mut self.state) {
[INFO] [stderr] 169 |             FutState::New => {
[INFO] [stderr] 170 |                 // RwLock hasn't yet been modified; nothing to do
[INFO] [stderr] 171 |             },
[INFO] [stderr] 172 |             FutState::Pending(ref mut rx) => {
[INFO] [stderr] 173 |                 rx.close();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/rwlock.rs:205:35
[INFO] [stderr]     |
[INFO] [stderr] 205 |           let (result, new_state) = match &mut self.state {
[INFO] [stderr]     |  ___________________________________^
[INFO] [stderr] 206 | |             &mut FutState::New => {
[INFO] [stderr] 207 | |                 let mut lock_data = self.rwlock.inner.mutex.lock()
[INFO] [stderr] 208 | |                     .expect("sync::Mutex::lock");
[INFO] [stderr] ...   |
[INFO] [stderr] 238 | |             &mut FutState::Acquired => panic!("Double-poll of ready Future")
[INFO] [stderr] 239 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 205 |         let (result, new_state) = match *(&mut self.state) {
[INFO] [stderr] 206 |             FutState::New => {
[INFO] [stderr] 207 |                 let mut lock_data = self.rwlock.inner.mutex.lock()
[INFO] [stderr] 208 |                     .expect("sync::Mutex::lock");
[INFO] [stderr] 209 |                 if lock_data.exclusive || lock_data.num_readers > 0 {
[INFO] [stderr] 210 |                     let (tx, mut rx) = oneshot::channel::<()>();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]   --> src/mutex.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 | /         match &mut self.state {
[INFO] [stderr] 58 | |             &mut FutState::New => {
[INFO] [stderr] 59 | |                 // Mutex hasn't yet been modified; nothing to do
[INFO] [stderr] 60 | |             },
[INFO] [stderr] ...  |
[INFO] [stderr] 84 | |             }
[INFO] [stderr] 85 | |         }
[INFO] [stderr]    | |_________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(clippy::match_ref_pats)] on by default
[INFO] [stderr]    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]    |
[INFO] [stderr] 57 |         match *(&mut self.state) {
[INFO] [stderr] 58 |             FutState::New => {
[INFO] [stderr] 59 |                 // Mutex hasn't yet been modified; nothing to do
[INFO] [stderr] 60 |             },
[INFO] [stderr] 61 |             FutState::Pending(ref mut rx) => {
[INFO] [stderr] 62 |                 rx.close();
[INFO] [stderr]  ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/mutex.rs:94:35
[INFO] [stderr]     |
[INFO] [stderr] 94  |           let (result, new_state) = match &mut self.state {
[INFO] [stderr]     |  ___________________________________^
[INFO] [stderr] 95  | |             &mut FutState::New => {
[INFO] [stderr] 96  | |                 let mut mtx_data = self.mutex.inner.mutex.lock()
[INFO] [stderr] 97  | |                     .expect("sync::Mutex::lock");
[INFO] [stderr] ...   |
[INFO] [stderr] 127 | |             &mut FutState::Acquired => panic!("Double-poll of ready Future")
[INFO] [stderr] 128 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 94  |         let (result, new_state) = match *(&mut self.state) {
[INFO] [stderr] 95  |             FutState::New => {
[INFO] [stderr] 96  |                 let mut mtx_data = self.mutex.inner.mutex.lock()
[INFO] [stderr] 97  |                     .expect("sync::Mutex::lock");
[INFO] [stderr] 98  |                 if mtx_data.owned {
[INFO] [stderr] 99  |                     let (tx, mut rx) = oneshot::channel::<()>();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/rwlock.rs:77:9
[INFO] [stderr]     |
[INFO] [stderr] 77  | /         match &mut self.state {
[INFO] [stderr] 78  | |             &mut FutState::New => {
[INFO] [stderr] 79  | |                 // RwLock hasn't yet been modified; nothing to do
[INFO] [stderr] 80  | |             },
[INFO] [stderr] ...   |
[INFO] [stderr] 104 | |             }
[INFO] [stderr] 105 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 77  |         match *(&mut self.state) {
[INFO] [stderr] 78  |             FutState::New => {
[INFO] [stderr] 79  |                 // RwLock hasn't yet been modified; nothing to do
[INFO] [stderr] 80  |             },
[INFO] [stderr] 81  |             FutState::Pending(ref mut rx) => {
[INFO] [stderr] 82  |                 rx.close();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/rwlock.rs:114:35
[INFO] [stderr]     |
[INFO] [stderr] 114 |           let (result, new_state) = match &mut self.state {
[INFO] [stderr]     |  ___________________________________^
[INFO] [stderr] 115 | |             &mut FutState::New => {
[INFO] [stderr] 116 | |                 let mut lock_data = self.rwlock.inner.mutex.lock()
[INFO] [stderr] 117 | |                     .expect("sync::Mutex::lock");
[INFO] [stderr] ...   |
[INFO] [stderr] 147 | |             &mut FutState::Acquired => panic!("Double-poll of ready Future")
[INFO] [stderr] 148 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 114 |         let (result, new_state) = match *(&mut self.state) {
[INFO] [stderr] 115 |             FutState::New => {
[INFO] [stderr] 116 |                 let mut lock_data = self.rwlock.inner.mutex.lock()
[INFO] [stderr] 117 |                     .expect("sync::Mutex::lock");
[INFO] [stderr] 118 |                 if lock_data.exclusive {
[INFO] [stderr] 119 |                     let (tx, mut rx) = oneshot::channel::<()>();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/rwlock.rs:168:9
[INFO] [stderr]     |
[INFO] [stderr] 168 | /         match &mut self.state {
[INFO] [stderr] 169 | |             &mut FutState::New => {
[INFO] [stderr] 170 | |                 // RwLock hasn't yet been modified; nothing to do
[INFO] [stderr] 171 | |             },
[INFO] [stderr] ...   |
[INFO] [stderr] 195 | |             }
[INFO] [stderr] 196 | |         }
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 168 |         match *(&mut self.state) {
[INFO] [stderr] 169 |             FutState::New => {
[INFO] [stderr] 170 |                 // RwLock hasn't yet been modified; nothing to do
[INFO] [stderr] 171 |             },
[INFO] [stderr] 172 |             FutState::Pending(ref mut rx) => {
[INFO] [stderr] 173 |                 rx.close();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] warning: you don't need to add `&` to all patterns
[INFO] [stderr]    --> src/rwlock.rs:205:35
[INFO] [stderr]     |
[INFO] [stderr] 205 |           let (result, new_state) = match &mut self.state {
[INFO] [stderr]     |  ___________________________________^
[INFO] [stderr] 206 | |             &mut FutState::New => {
[INFO] [stderr] 207 | |                 let mut lock_data = self.rwlock.inner.mutex.lock()
[INFO] [stderr] 208 | |                     .expect("sync::Mutex::lock");
[INFO] [stderr] ...   |
[INFO] [stderr] 238 | |             &mut FutState::Acquired => panic!("Double-poll of ready Future")
[INFO] [stderr] 239 | |         };
[INFO] [stderr]     | |_________^
[INFO] [stderr]     |
[INFO] [stderr]     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_ref_pats
[INFO] [stderr] help: instead of prefixing all patterns with `&`, you can dereference the expression
[INFO] [stderr]     |
[INFO] [stderr] 205 |         let (result, new_state) = match *(&mut self.state) {
[INFO] [stderr] 206 |             FutState::New => {
[INFO] [stderr] 207 |                 let mut lock_data = self.rwlock.inner.mutex.lock()
[INFO] [stderr] 208 |                     .expect("sync::Mutex::lock");
[INFO] [stderr] 209 |                 if lock_data.exclusive || lock_data.num_readers > 0 {
[INFO] [stderr] 210 |                     let (tx, mut rx) = oneshot::channel::<()>();
[INFO] [stderr]   ...
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]  --> benches/mutex.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(test)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `futures-locks`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "c094e42a0531ead934440ccce417bec176e5f5d442827bc7248f45dd10e0303b"`
[INFO] running `"docker" "rm" "-f" "c094e42a0531ead934440ccce417bec176e5f5d442827bc7248f45dd10e0303b"`
[INFO] [stdout] c094e42a0531ead934440ccce417bec176e5f5d442827bc7248f45dd10e0303b