syntax_data: {"ast_node_type":"function","tokens":[{"end":68,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn span_take_while<P>(&self, sp: Span, predicate: P) -> Span
context_before:     /// Given a `Span`, gets a shorter one until `predicate` yields `false`.
context_after:     where