tests/ui/or-patterns/inconsistent-modes.rs

   1 // This test ensures that or patterns require binding mode consistency across arms.
   2
   3 #![allow(non_camel_case_types)]
   4 fn main() {
   5     // One level:
   6     let (Ok(a) | Err(ref a)): Result<&u8, u8> = Ok(&0);
   7     //~^ ERROR variable `a` is bound inconsistently
   8     let (Ok(ref mut a) | Err(a)): Result<u8, &mut u8> = Ok(0);
   9     //~^ ERROR variable `a` is bound inconsistently
  10     let (Ok(ref a) | Err(ref mut a)): Result<&u8, &mut u8> = Ok(&0);
  11     //~^ ERROR variable `a` is bound inconsistently
  12     //~| ERROR mismatched types
  13     let (Ok((ref a, b)) | Err((ref mut a, ref b))) = Ok((0, &0));
  14     //~^ ERROR variable `a` is bound inconsistently
  15     //~| ERROR variable `b` is bound inconsistently
  16     //~| ERROR mismatched types
  17
  18     // Two levels:
  19     let (Ok(Ok(a) | Err(a)) | Err(ref a)) = Err(0);
  20     //~^ ERROR variable `a` is bound inconsistently
  21
  22     // Three levels:
  23     let (Ok([Ok((Ok(ref a) | Err(a),)) | Err(a)]) | Err(a)) = Err(&1);
  24     //~^ ERROR variable `a` is bound inconsistently
  25 }