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error[E0106]: missing lifetime specifier
--> $DIR/issue-86667.rs:6:35
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LL | async fn a(s1: &str, s2: &str) -> &str {
| ---- ---- ^ 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 `s1` or `s2`
help: consider introducing a named lifetime parameter
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LL | async fn a<'a>(s1: &'a str, s2: &'a str) -> &'a str {
| ++++ ++ ++ ++
error[E0106]: missing lifetime specifier
--> $DIR/issue-86667.rs:12:29
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LL | fn b(s1: &str, s2: &str) -> &str {
| ---- ---- ^ 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 `s1` or `s2`
help: consider introducing a named lifetime parameter
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LL | fn b<'a>(s1: &'a str, s2: &'a str) -> &'a str {
| ++++ ++ ++ ++
error: lifetime may not live long enough
--> $DIR/issue-86667.rs:8:5
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LL | async fn a(s1: &str, s2: &str) -> &str {
| - let's call the lifetime of this reference `'1`
LL |
LL | s1
| ^^ returning this value requires that `'1` must outlive `'static`
error: aborting due to 3 previous errors
For more information about this error, try `rustc --explain E0106`.
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