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error[E0059]: type parameter to bare `Fn` trait must be a tuple
--> $DIR/non-tupled-arg-mismatch.rs:3:9
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LL | fn a<F: Fn<usize>>(f: F) {}
| ^^^^^^^^^ the trait `Tuple` is not implemented for `usize`
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note: required by a bound in `Fn`
--> $SRC_DIR/core/src/ops/function.rs:LL:COL
error[E0308]: mismatched types
--> $DIR/non-tupled-arg-mismatch.rs:7:5
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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 2 previous errors
Some errors have detailed explanations: E0059, E0308.
For more information about an error, try `rustc --explain E0059`.
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