syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"ty::PredicateKind::AliasRelate(term,"}]}
source_snippet:                 ty::PredicateKind::AliasRelate(term, new_infer, ty::AliasRelationDirection::Equate),
context_before:                 self.param_env,
context_after:             );