syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // This format occurs 1-2 orders of magnitude more often than others (#125017),
context_before:             InlineCtxt(span) => {
context_after:                 // so it makes sense to micro-optimize it to avoid `span.data()` and `Span::new()`.