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error[E0637]: `'_` cannot be used here
--> $DIR/E0637.rs:1:24
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LL | fn underscore_lifetime<'_>(str1: &'_ str, str2: &'_ str) -> &'_ str {
| ^^ `'_` is a reserved lifetime name
error[E0106]: missing lifetime specifier
--> $DIR/E0637.rs:1:62
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LL | fn underscore_lifetime<'_>(str1: &'_ str, str2: &'_ 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 `str1` or `str2`
help: consider introducing a named lifetime parameter
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LL | fn underscore_lifetime<'a, '_>(str1: &'a str, str2: &'a str) -> &'a str {
| +++ ~~ ~~ ~~
error[E0637]: `&` without an explicit lifetime name cannot be used here
--> $DIR/E0637.rs:13:13
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LL | T: Into<&u32>,
| ^ explicit lifetime name needed here
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0106, E0637.
For more information about an error, try `rustc --explain E0106`.
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