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error[E0308]: mismatched types
--> $DIR/issue-51154.rs:2:30
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LL | fn foo<F: FnMut()>() {
| - this type parameter
LL | let _: Box<F> = Box::new(|| ());
| ^^^^^ expected type parameter `F`, found closure
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= note: expected type parameter `F`
found closure `[closure@$DIR/issue-51154.rs:2:30: 2:35]`
= help: every closure has a distinct type and so could not always match the caller-chosen type of parameter `F`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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