syntax_data: {"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"self.register_predicates([ty::Binder::dummy(match"}]}
source_snippet:         self.register_predicates([ty::Binder::dummy(match self.ambient_variance {
context_before:     fn register_alias_relate_predicate(&mut self, a: I::Ty, b: I::Ty) {
context_after:             ty::Covariant => ty::PredicateKind::AliasRelate(