syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"Span::new(self.lo,"}]}
source_snippet:         Span::new(self.lo, self.hi, ctxt, self.parent)
context_before:     fn with_ctxt(&self, ctxt: SyntaxContext) -> Span {
context_after:     }