private static void CgConcatExp(FuncInfo fi, ConcatExp node, int a)
{
foreach (var subExp in node.Exps)
{
var tmp = fi.AllocReg();
CgExp(fi, subExp, tmp, 1);
}
var c = fi.UsedRegs - 1;
var b = c - node.Exps.Count + 1;
fi.FreeRegs(c - b + 1);
fi.EmitABC(EOpCode.OP_CONCAT, a, b, c);
}
