syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"assert_eq!(impl_trait_ref.self_ty(),"}]}
source_snippet:                 assert_eq!(impl_trait_ref.self_ty(), self_ty);
context_before:             Some(impl_trait_ref) => {
context_after:                 *impl_trait_ref = self.tcx.normalize_erasing_regions(typing_env, *impl_trait_ref);