elemtype := s.Type().Elem()

	// Decompose slice.
	oldPtr := ir.NewUnaryExpr(base.Pos, ir.OSPTR, s)
	oldLen := ir.NewUnaryExpr(base.Pos, ir.OLEN, s)
	oldCap := ir.NewUnaryExpr(base.Pos, ir.OCAP, s)

	// Number of elements we are adding
	num := ir.NewUnaryExpr(base.Pos, ir.OLEN, l2)

	// newLen := oldLen + num

	if wantABI != obj.ABIInternal {
		base.ErrorfAt(pos, 0, "internal/abi.FuncPC%s does not accept func expression, which is ABIInternal", wantABI)
	}
	var e Node = NewUnaryExpr(pos, OIDATA, n)
	e.SetType(types.Types[types.TUINTPTR].PtrTo())
	e.SetTypecheck(1)
	e = NewStarExpr(pos, e)
	e.SetType(types.Types[types.TUINTPTR])
	e.SetTypecheck(1)
	return e
}