syntax_data: {"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"assert_eq!(a_kind,"}]}
source_snippet:             assert_eq!(a_kind, b_kind);
context_before:             let alias_ty = relation.relate(a_data, b_data)?;
context_after:             Ok(Ty::new_alias(cx, a_kind, alias_ty))