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error[E0308]: mismatched types
--> $DIR/issue-6458-4.rs:1:20
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LL | fn foo(b: bool) -> Result<bool,String> {
| --- ^^^^^^^^^^^^^^^^^^^ expected enum `Result`, found `()`
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| implicitly returns `()` as its body has no tail or `return` expression
LL | Err("bar".to_string());
| - help: remove this semicolon to return this value
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= note: expected enum `Result<bool, String>`
found unit type `()`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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