syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"foreign_expn_data:"}]}
source_snippet:             foreign_expn_data: FxHashMap::default(),
context_before:             local_expn_hashes: IndexVec::from_elem_n(ExpnHash(Fingerprint::ZERO), 1),
context_after:             foreign_expn_hashes: FxHashMap::default(),