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$ cargo run
Compiling chapter10 v0.1.0 (file:///projects/chapter10)
error[E0106]: missing lifetime specifier
--> src/main.rs:9:33
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9 | fn longest(x: &str, y: &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 `x` or `y`
help: consider introducing a named lifetime parameter
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9 | fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
| ++++ ++ ++ ++
For more information about this error, try `rustc --explain E0106`.
error: could not compile `chapter10` due to previous error
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