syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"self.span_take_while(sp,"}]}
source_snippet:         self.span_take_while(sp, |c| !c.is_whitespace())
context_before:     pub fn span_until_whitespace(&self, sp: Span) -> Span {
context_after:     }