rust/tests/ui/suggestions/issue-105645.rs

fn main() {
    let mut buf = [0u8; 50];
    let mut bref = buf.as_slice();
    foo(&mut bref);
    //~^ ERROR 4:9: 4:18: the trait bound `&[u8]: std::io::Write` is not satisfied [E0277]
}

fn foo(_: &mut impl std::io::Write) {}
Remove invalid case for mutable borrow suggestion If we have a call such as `foo(&mut buf)` and after reference collapsing the type is inferred as `&T` where-as the required type is `&mut T`, don't suggest `foo(&mut mut buf)`. This is wrong syntactically and the issue lies elsewhere, not in the borrow. Fixes #105645 2022-12-13 10:27:48 +00:00			`fn main() {`
			`let mut buf = [0u8; 50];`
			`let mut bref = buf.as_slice();`
			`foo(&mut bref);`
			//~^ ERROR 4:9: 4:18: the trait bound `&[u8]: std::io::Write` is not satisfied [E0277]
			`}`

			`fn foo(_: &mut impl std::io::Write) {}`