I've been seeing this weird looping behavior with some go loops over the last few days. An exception is being thrown from a function within the loop and rather than logging and looping back around to a waiting take, the loop seems to just hop back to the line before the function call.
I've managed to boil it down to the following:
Now if you (>!! s :a), you'll see the throwable printed out and the loop go back to waiting on the s channel. However, (>!! d :a) and you'll get to enjoy an infinite stream of 'Double'. In actual fact you can remove the -loop from double and get the same result.
Not sure what's going on here at all. In the macro expanded version of double '(prn t)' doesn't appear at all (it does in single's expansion), so it looks like it's not surviving the move into the state machine and instead is routing back to (prn "Double") or the take isn't really completing somehow, leaving the :a on the chan.