syntax_data: {"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":".map(|expn|"}]}
source_snippet:                     .map(|expn| (expn, data.expn_data(expn).clone(), data.expn_hash(expn)))
context_before:                 latest_expns
context_after:                     .collect()