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error[E0308]: mismatched types
--> $DIR/fully-qualified-type-name4.rs:6:12
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LL | fn bar(x: usize) -> Option<usize> {
| ------------- expected `Option<usize>` because of return type
LL | return x;
| ^ expected `Option<usize>`, found `usize`
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= note: expected enum `Option<usize>`
found type `usize`
help: try wrapping the expression in `Some`
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LL | return Some(x);
| +++++ +
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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