public dynamic Invoke(Scope scope)
{
string id = null;
if (Left is MemberExpression)
id = ((Identifier)((MemberExpression)Left).Property).Id;
var val = ((IOperation)Right).Invoke(scope);
if (Left is MemberExpression)
{
scope.SetThis(id, val);
}
else if (Left is Identifier)
{
scope.SetVar(((Identifier)Left).Id, val);
}
else
throw new Exception();
return val;
}