Thank you for the working example! Now it works as it should.
* * *
Your second example always return 1 in a loop, because it yields a.
Your output is:
1
1
1
1
1
10
100
and one could think new iterators have been invoked (with the starting values
of a = 10 and 100, respectively).
Changing to yield c gives:
1
1
1
1
1
20
999
Now it is clear that (in both cases) iterator just continues where it has
stopped, there was no new iterators!
But the syntax (to me) really feels/looks like a new iterator (with new
starting values) was called. I can't shake the feeling about wrong-looking
syntax.
* * *
Your first example with proc slightly remedies this.
There is system.finished which can be used with iterators. I still think some
kind of system.next would be of great help with readability/usability of
iterators.
