syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"PredicateKind::Clause(a)"}]}
source_snippet:             PredicateKind::Clause(a) => a.fmt(f),
context_before:         match self {
context_after:             PredicateKind::Subtype(pair) => pair.fmt(f),