syntax_data: {"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// those 8 bytes. Any `SpanData` whose fields don't fit into a `Span` are
context_before: /// vast majority (99.9%+) of `SpanData` instances can be made to fit within
context_after: /// stored in a separate interner table, and the `Span` will index into that