syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"self.apply_mark(expn_id.to_expn_id(),"}]}
source_snippet:         self.apply_mark(expn_id.to_expn_id(), Transparency::Transparent)
context_before:         let expn_id = LocalExpnId::fresh(expn_data, ctx);
context_after:     }