{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"(&ty::Ref(r_a,"}]}
        (&ty::Ref(r_a, _, mutbl_a), ty::Ref(r_b, _, mutbl_b))
    match (source.kind(), target.kind()) {
            if r_a == *r_b && mutbl_a == *mutbl_b =>