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error[E0106]: missing lifetime specifiers
--> $DIR/issue-84592.rs:12:57
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LL | fn two_lifetimes_needed(a: &(), b: &()) -> TwoLifetimes<'_, '_> {
| --- --- ^^ ^^ expected named lifetime parameter
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| expected named lifetime parameter
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= help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from `a` or `b`
help: consider introducing a named lifetime parameter
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LL | fn two_lifetimes_needed<'a>(a: &'a (), b: &'a ()) -> TwoLifetimes<'a, 'a> {
| ++++ ++ ++ ~~ ~~
error: aborting due to previous error
For more information about this error, try `rustc --explain E0106`.
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