src/test/ui/pattern/usefulness/refutable-pattern-errors.stderr

   1 error[E0005]: refutable pattern in function argument: `(_, _)` not covered
   2   --> $DIR/refutable-pattern-errors.rs:3:9
   3    |
   4 LL | fn func((1, (Some(1), 2..=3)): (isize, (Option<isize>, isize))) { }
   5    |         ^^^^^^^^^^^^^^^^^^^^^ pattern `(_, _)` not covered
   6    |
   7    = note: the matched value is of type `(isize, (std::option::Option<isize>, isize))`
   8
   9 error[E0005]: refutable pattern in local binding: `(std::i32::MIN..=0i32, _)` and `(2i32..=std::i32::MAX, _)` not covered
  10   --> $DIR/refutable-pattern-errors.rs:7:9
  11    |
  12 LL |     let (1, (Some(1), 2..=3)) = (1, (None, 2));
  13    |         ^^^^^^^^^^^^^^^^^^^^^ patterns `(std::i32::MIN..=0i32, _)` and `(2i32..=std::i32::MAX, _)` not covered
  14    |
  15    = note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
  16    = note: for more information, visit https://doc.rust-lang.org/book/ch18-02-refutability.html
  17    = note: the matched value is of type `(i32, (std::option::Option<i32>, i32))`
  18 help: you might want to use `if let` to ignore the variant that isn't matched
  19    |
  20 LL |     if let (1, (Some(1), 2..=3)) = (1, (None, 2)) { /* */ }
  21    |
  22
  23 error: aborting due to 2 previous errors
  24
  25 For more information about this error, try `rustc --explain E0005`.