warning: redundant pattern matching, consider using `is_err()`
   --> src/lib.rs:706:24
    |
706 |                 if let Err(..) = self.waiting.send((thread::current(), self.head)) {
    |                 -------^^^^^^^---------------------------------------------------- help: try this: `if self.waiting.send((thread::current(), self.head)).is_err()`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching

warning: redundant pattern matching, consider using `is_err()`
   --> src/lib.rs:526:16
    |
526 |         if let Err(..) = self.broadcast_inner(val, true) {
    |         -------^^^^^^^---------------------------------- help: try this: `if self.broadcast_inner(val, true).is_err()`
    |
    = note: this will change drop order of the result, as well as all temporaries
    = note: add `#[allow(clippy::redundant_pattern_matching)]` if this is important
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#redundant_pattern_matching
    = note: `#[warn(clippy::redundant_pattern_matching)]` on by default

warning: lint `clippy::drop_ref` has been renamed to `dropping_references`
   --> src/lib.rs:224:21
    |
224 |             #[allow(clippy::drop_ref)]
    |                     ^^^^^^^^^^^^^^^^ help: use the new name: `dropping_references`
    |
    = note: `#[warn(renamed_and_removed_lints)]` on by default