Creation generator inside function call is broken

I have many tests and I made much common code with generators. They make my tests more clearly and shorter.
But after #1913 my code is broken.

I have alike code:
```
int makeGenerator(int x) { return GENERATOR(x, x+1, x+2); }

void test()
{
int a = makeGenerator(10);
int b = makeGenerator(5);
CHECK(a > b);
}
```
It worked fine before #1913.
After this change **b** have taken wrong values.
As I understand, because new code thinks that is the same generator.

Of course in this situation I can replace function **makeGenerator()** by macros.
But I have more complex functions with checkings, filtering and returning different generators in dependent of parameters.
And its replacing with macroses creates "not good" code.

Was the code so bad before #1913?