fmt.Fprintln(&buf)
	fmt.Fprintln(&buf, `import "image/color"`)
	fmt.Fprintln(&buf)
	printPlan9(&buf)
	printWebSafe(&buf)

	data, err := format.Source(buf.Bytes())
	if err != nil {
		log.Fatal(err)
	}
	err = os.WriteFile(*filename, data, 0644)
	if err != nil {
		log.Fatal(err)
	}
}

func printPlan9(w io.Writer) {
	c, lines := [3]int{}, [256]string{}
	for r, i := 0, 0; r != 4; r++ {

		p.print(token.LPAREN)
		p.expr0(x, reduceDepth(depth)) // parentheses undo one level of depth
		p.print(token.RPAREN)
		return
	}

	printBlank := prec < cutoff

	ws := indent
	p.expr1(x.X, prec, depth+diffPrec(x.X, prec))
	if printBlank {
		p.print(blank)
	}
	xline := p.pos.Line // before the operator (it may be on the next line!)
	yline := p.lineFor(x.Y.Pos())
	p.setPos(x.OpPos)