syntax_data: {"ast_node_type":"function","tokens":[{"end":73,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn outer_mark(&self, ctxt: SyntaxContext) -> (ExpnId, Transparency) {
context_before:     #[inline]
context_after:         let data = &self.syntax_context_data[ctxt.0 as usize];