1 error[E0207]: the type parameter `I` is not constrained by the impl trait, self type, or predicates
2 --> $DIR/issue-88526.rs:25:13
4 LL | impl<'q, Q, I, F> A for TestB<Q, F>
5 | ^ unconstrained type parameter
7 error: aborting due to previous error
9 For more information about this error, try `rustc --explain E0207`.