warning: unneeded `return` statement
  --> azalea/build.rs:10:18
   |
10 |         Ok(_) => return, // nightly
   |                  ^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_return
   = note: `#[warn(clippy::needless_return)]` on by default
help: replace `return` with a unit value
   |
10 |         Ok(_) => (), // nightly
   |                  ~~