syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Extends the given `Span` to just before the next occurrence of `c`.
context_after:     pub fn span_extend_to_next_char(&self, sp: Span, c: char, accept_newlines: bool) -> Span {