syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:         match expn_id.as_local() {
context_before:     fn expn_hash(&self, expn_id: ExpnId) -> ExpnHash {
context_after:             Some(expn_id) => self.local_expn_hashes[expn_id],