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error[E0207]: the lifetime parameter `'a` is not constrained by the impl trait, self type, or predicates
--> $DIR/issue-74761-2.rs:7:6
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LL | impl<'a, 'b> A for () {
| ^^ unconstrained lifetime parameter
error[E0207]: the lifetime parameter `'b` is not constrained by the impl trait, self type, or predicates
--> $DIR/issue-74761-2.rs:7:10
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LL | impl<'a, 'b> A for () {
| ^^ unconstrained lifetime parameter
error[E0792]: expected generic lifetime parameter, found `'_`
--> $DIR/issue-74761-2.rs:12:28
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LL | impl<'a, 'b> A for () {
| -- this generic parameter must be used with a generic lifetime parameter
...
LL | fn f(&self) -> Self::B {}
| ^^
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0207, E0792.
For more information about an error, try `rustc --explain E0207`.
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