syntax_data: {"ast_node_type":"function","tokens":[{"end":53,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn with_span_pos(self, span: Span) -> Ident {
context_before:     /// Replaces `lo` and `hi` with those from `span`, but keep hygiene context.
context_after:         Ident::new(self.name, span.with_ctxt(self.span.ctxt()))