| error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates | |
| --> $DIR/issue-29861.rs:21:6 | |
| | | |
| LL | impl<'a, T: 'a> MakeRef2 for T { | |
| | ^^ unconstrained lifetime parameter | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0207`. |