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error[E0308]: mismatched types
--> $DIR/non-tupled-arg-mismatch.rs:6:5
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LL | a(|_: usize| {});
| ^ types differ
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= note: expected trait `Fn<usize>`
found trait `Fn<(usize,)>`
note: required by a bound in `a`
--> $DIR/non-tupled-arg-mismatch.rs:3:9
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LL | fn a<F: Fn<usize>>(f: F) {}
| ^^^^^^^^^ required by this bound in `a`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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