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error[E0308]: mismatched types
--> $DIR/universal-mismatched-type.rs:4:5
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LL | fn foo(x: impl Debug) -> String {
| ---------- ------ expected `String` because of return type
| |
| found this type parameter
LL | x
| ^ expected `String`, found type parameter `impl Debug`
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= note: expected struct `String`
found type parameter `impl Debug`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.
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