// from rfc2005 test suite


// Verify the binding mode shifts - only when no `&` are auto-dereferenced is the
// final default binding mode mutable.

fn main() {
    let Some(n): &mut Option<i32> = &&Some(5i32) else { return }; //~ ERROR mismatched types
    *n += 1;
    let _ = n;

    let Some(n): &mut Option<i32> = &&mut Some(5i32) else { return }; //~ ERROR mismatched types
    *n += 1;
    let _ = n;
}