| fn main() { |
| let mut i: i64; |
| // Expected type is an inference variable `?T` |
| // because the `match` is used as a statement. |
| // This is the "initial" type of the `coercion`. |
| match i { |
| // Add `bool` to the overall `coercion`. |
| 0 => true, |
| |
| // Necessary to cause the ICE: |
| 1 => true, |
| |
| // Suppose that we had `let _: bool = match i { ... }`. |
| // In that case, as the expected type would be `bool`, |
| // we would suggest `i == 1` as a fix. |
| // |
| // However, no type error happens when checking `i = 1` because `expected == ?T`, |
| // which will unify with `typeof(i = 1) == ()`. |
| // |
| // However, in #67273, we would delay the unification of this arm with the above |
| // because we used the hitherto accumulated coercion as opposed to the "initial" type. |
| 2 => i = 1, |
| //~^ ERROR match arms have incompatible types |
| |
| _ => (), |
| } |
| } |
