syntax_data: {"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: ///   with a peak usually at 3 or 4, and then it drops off quickly from 8
context_before: ///   crate size. The most common numbers of bits for `len` are from 0 to 7,
context_after: ///   onwards. 15 bits is enough for 99.99%+ of cases, but larger values