syntax_data: {"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"self.param_env,"}]}
source_snippet:                 self.param_env,
context_before:                 self.cause.clone(),
context_after:                 ty::PredicateKind::AliasRelate(term, new_infer, ty::AliasRelationDirection::Equate),