error: this if-then-else expression returns a bool literal
   --> src/inflight.rs:188:9
    |
188 | /         if (self.max_cap == 0 || self.cur_cap.get() < self.max_cap)
189 | |             && (self.max_size == 0 || self.cur_size.get() <= self.max_size)
190 | |         {
191 | |             true
192 | |         } else {
193 | |             false
194 | |         }
    | |_________^ help: you can reduce it to: `(self.max_cap == 0 || self.cur_cap.get() < self.max_cap) && (self.max_size == 0 || self.cur_size.get() <= self.max_size)`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_bool
note: the lint level is defined here
   --> src/lib.rs:1:27
    |
1   | #![deny(rust_2018_idioms, warnings, unreachable_pub)]
    |                           ^^^^^^^^
    = note: `#[deny(clippy::needless_bool)]` implied by `#[deny(warnings)]`