{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"argmap.insert_full((arg_index,"}]}
                    argmap.insert_full((arg_index, ArgumentType::Format(placeholder.format_trait)));
                let (i, _) =
                self.alloc_expr_desugared(Expr::Literal(Literal::Uint(