{"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"err.span_label(ty_span,"}]}
                        err.span_label(ty_span, format!("returning this {descr}type `{ty}`"));
                        let descr = if ty.is_impl_trait() { "opaque " } else { "" };
                        seen.insert(ty_span);