rust/tests/ui/issues/issue-51154.rs

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fn foo<F: FnMut()>() {
    let _: Box<F> = Box::new(|| ());
    //~^ ERROR mismatched types
}

fn main() {}
diag: improve closure/generic parameter mismatch This commit improves the diagnostic when a type parameter is expected and a closure is found, noting that each closure has a distinct type and therefore could not always match the caller-chosen type of the parameter. Signed-off-by: David Wood <david@davidtw.co> 2020-09-14 14:21:38 +00:00			`fn foo<F: FnMut()>() {`
			`let _: Box<F> = Box::new(\|\| ());`
			`//~^ ERROR mismatched types`
			`}`

			`fn main() {}`