{"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"//"}]}
            // catch it in this case.
            // pattern should have read-only access to the scrutinee, and the borrow checker won't
            pat_info.max_ref_mutbl = pat_info.max_ref_mutbl.cap_to_weakly_not(pat_prefix_span);