message: Use binary operator in image example format
diff: @@ -15,5 +15,5 @@ def main = {
  /// The height of the image, in pixels.
  height <- u32be,
  /// The pixel data.
  - pixels <- repeat_len32 (u32_mul width height) pixel, // TODO: binary operators
  + pixels <- repeat_len32 (width * height) pixel,
  };
  