syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: ///   interning. The number of bits needed for `len` does not depend on the
context_before: ///   bits in `SpanData`, which means that large `len` values will cause
context_after: ///   crate size. The most common numbers of bits for `len` are from 0 to 7,