I do wish Rust had something like this too

You can put it at the top of your file with a #! too, if you want it to apply to the whole file.

  pub fn abc() -> usize {
      #[allow(deprecated)]
      "abc".len()
  }

I refactor code all the time and find these stray "allow"s that aren't doing anything anymore

Both this and the reply saying you should open an RFC worry me that it was tongue-in-cheek.

Or maybe it's the obvious name choice, heh, because it literally exists with that very syntax: https://play.rust-lang.org/?version=nightly&mode=debug&editi...

Not stable yet, as you can see, but all the RFC and implementation work has been done, and a stabilization report was even put forward back in July: https://github.com/rust-lang/rust/issues/54503#issuecomment-...