SymbolTable::~SymbolTable()
{
    for (map<int, VarType*>::iterator it = varTypes.begin();
         it != varTypes.end();
         ++it)
    {
        delete it->second;
    }

    for (map<int, VarType*>::iterator it = funcTypes.begin();
         it != funcTypes.end();
         ++it)
    {
        delete it->second;
    }

    for (map<int, vector<VarType*> >::iterator it = funcParams.begin();
         it != funcParams.end();
         ++it)
    {
        for (vector<VarType*>::iterator it2 = it->begin();
             it2 != it->end();
             ++it2)
        {
            delete *it2;
        }
    }
}