syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// span if a `SpanSnippetError` was encountered.
context_before:     /// Extends the span to include any trailing whitespace, or returns the original
context_after:     pub fn span_extend_while_whitespace(&self, span: Span) -> Span {