1 error[E0277]: the trait bound `(): Add<A>` is not satisfied
2 --> $DIR/associated-types-ICE-when-projecting-out-of-err.rs:23:11
5 | ^ the trait `Add<A>` is not implemented for `()`
7 error: aborting due to previous error
9 For more information about this error, try `rustc --explain E0277`.