syntax_data: {"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"debug_assert_eq!(expn_id,"}]}
source_snippet:             debug_assert_eq!(expn_id, _eid);
context_before:             let _eid = data.local_expn_hashes.push(expn_hash);
context_after:             let _old_id = data.expn_hash_to_expn_id.insert(expn_hash, expn_id.to_expn_id());