syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"MixedBitSet::Small(set)"}]}
source_snippet:             MixedBitSet::Small(set) => set.fmt_with(ctxt, f),
context_before:         match self {
context_after:             MixedBitSet::Large(set) => set.fmt_with(ctxt, f),