syntax_data: {"ast_node_type":"other","tokens":[{"end":92,"kind":"keyword","start":0,"text":"ty::PredicateKind::Subtype(ty::SubtypePredicate"}]}
source_snippet:             ty::PredicateKind::Subtype(ty::SubtypePredicate { a_is_expected: _, a, b }) => {
context_before:             }
context_after:                 self.add_ty(a);