a = stackBufAddr(4, types.Types[types.TUINT8])
	}
	// intstring(*[4]byte, rune)
	return mkcall("intstring", n.Type(), init, a, typecheck.Conv(n.X, types.Types[types.TINT64]))
}

// walkStringToBytes walks an OSTR2BYTES node.
func walkStringToBytes(n *ir.ConvExpr, init *ir.Nodes) ir.Node {
	s := n.X
	if ir.IsConst(s, constant.String) {
		sc := ir.StringVal(s)

		// Allocate a [n]byte of the right size.

		return walkBytesRunesToString(n, init)

	case ir.OBYTES2STRTMP:
		n := n.(*ir.ConvExpr)
		return walkBytesToStringTemp(n, init)

	case ir.OSTR2BYTES:
		n := n.(*ir.ConvExpr)
		return walkStringToBytes(n, init)

	case ir.OSTR2BYTESTMP:
		n := n.(*ir.ConvExpr)
		return walkStringToBytesTemp(n, init)

	case ir.OSTR2RUNES:
		n := n.(*ir.ConvExpr)
		return walkStringToRunes(n, init)