// Check sub_pat got a `ref` keyword (excluding `ref mut`).
if let PatKind::Binding(BindingAnnotation::Ref, .., spanned_name, _) = sub_pat.kind;
// Check sub_pat got a `ref` keyword (excluding `ref mut`).
if let PatKind::Binding(BindingAnnotation::Ref, .., spanned_name, _) = sub_pat.kind;