{"ast_node_type":"other","tokens":[{"end":39,"kind":"keyword","start":0,"text":"ExprKind::Call(path,"}]}
            ExprKind::Call(path, [arg])
            // <*<const/mut> <ty>>::is_null(fn_ptr as *<const/mut> <ty>)
                if let ExprKind::Path(ref qpath) = path.kind