error[E0308]: mismatched types --> $DIR/let-else-binding-explicit-mut-annotated.rs:9:37 | LL | let Some(n): &mut Option<i32> = &&Some(5i32) else { return }; | ---------------- ^^^^^^^^^^^^ types differ in mutability | | | expected due to this | = note: expected mutable reference `&mut Option<i32>` found reference `&&Option<i32>` error[E0308]: mismatched types --> $DIR/let-else-binding-explicit-mut-annotated.rs:13:37 | LL | let Some(n): &mut Option<i32> = &&mut Some(5i32) else { return }; | ---------------- ^^^^^^^^^^^^^^^^ types differ in mutability | | | expected due to this | = note: expected mutable reference `&mut Option<i32>` found reference `&&mut Option<i32>` error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0308`.