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error[E0059]: cannot use call notation; the first type parameter for the function trait is neither a tuple nor unit
--> $DIR/E0059.rs:3:41
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LL | fn foo<F: Fn<i32>>(f: F) -> F::Output { f(3) }
| ^^^^
error: aborting due to previous error
For more information about this error, try `rustc --explain E0059`.
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