syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"self.map_ctxt(|ctxt|"}]}
source_snippet:         self.map_ctxt(|ctxt| ctxt.apply_mark(expn_id, transparency))
context_before:     pub fn apply_mark(self, expn_id: ExpnId, transparency: Transparency) -> Span {
context_after:     }