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error[E0277]: expected a `Fn<_>` closure, found `fn() -> str`
--> $DIR/builtin-fn-must-return-sized.rs:15:11
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LL | foo::<fn() -> str, _>(None, ());
| ^^^^^^^^^^^ expected an `Fn<_>` closure, found `fn() -> str`
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= help: the trait `Fn<_>` is not implemented for `fn() -> str`
note: required by a bound in `foo`
--> $DIR/builtin-fn-must-return-sized.rs:10:11
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LL | fn foo<F: Fn<T>, T: Tuple>(f: Option<F>, t: T) {
| ^^^^^ required by this bound in `foo`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0277`.
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