syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"ty::PredicateKind::Coerce(ty::CoercePredicate"}]}
source_snippet:             ty::PredicateKind::Coerce(ty::CoercePredicate { a, b }) => {
context_before:             }
context_after:                 self.add_ty(a);