(loop [x :range [1 nil 2]]) now broken, used to count odd numbers forever

[jackpipe]

As the title, I have a prime-number generator using a fiber/generator/coroutine and this was a useful trick to not have to specify an upper limit on the main loop.

Now it runs the loop once with a value of 0 and then quits? Not sure, but it doesn't do what it used to.

[sogaiu]

AFAICT, it works in this commit, but not in the one after.

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FWIW, on a related note, there is some prime-number-related functionality in spork now:

• Add functions for primality testing
• Add math/factor

[primo-ppcg]

Quick fix:

repl:1:> (def g (generate [x :range [1 () 2]] x))
<fiber 0x5620123A2760>
repl:2:> (take 10 g)
@[1 3 5 7 9 11 13 15 17 19]

Works because:

repl:3:> (< 1 nil)
true
repl:4:> (< 1 ())
true

I don't know that I'd recommend doing this, though. Using forever with an increment would avoid an unnecessary comparison each iteration, and would be more clear.