{"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"if"}]}
                if let ByRef::Yes(def_br_mutbl) = def_br {
            BindingMode(ByRef::Yes(user_br_mutbl), _) => {
                    // `ref`/`ref mut` overrides the binding mode on edition <= 2021