public override void OutAIntConstExp(AIntConstExp node)
{
// check: valid 32 bit integer
// annotate: type and value in current scope.
long result = RuntimeEnvironment.ConvertToLong(node.GetValue());
PType type = RuntimeEnvironment.GetSmallestFit(result);
Env.CurrentScope.Add(node, result, type);
base.OutAIntConstExp(node);
}