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error: expected one of `(`, `+`, `,`, `::`, `<`, or `{`, found `->`
--> $DIR/issue-108109-fn-trait-missing-paren.rs:3:34
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LL | pub fn func<F>() where F: FnOnce -> () {}
| -------^^ expected one of `(`, `+`, `,`, `::`, `<`, or `{`
| | |
| | help: try adding parentheses
| `Fn` bounds require arguments in parentheses
error: aborting due to 1 previous error
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