// ERROR:9:unknown name
// io.buf_writer was the callback-based writer that 351e5db replaced with the
// Writer handle enum. This fixture keeps it from coming back.
unit bad_bufw;

fn main() -> void {
    var raw: [4]u8 = [0, 0, 0, 0];
    var buf: []mut u8 = raw[..];
    let w = io.buf_writer(buf);
}