syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// identifier represented by its position in the vector.
context_before:     /// Spans passed to `proc_macro::quote_span`. Each span has a numerical
context_after:     proc_macro_quoted_spans: AppendOnlyVec<Span>,