I'm not at all following this yet, but ghc-7.8 does seem to be involved. It
seems that a nearly minimal example is already present in the tutorial --
presumably `work.hs` printed at the end of it used to work fine, but with
ghc-7.8 I get:
1
2
3
... etc ..
99
100
101
102
103
104
hi
Worker #2: Processed 2
Worker #1: Processed 1
Worker #3: Processed 3
105
106
107
hoWorker #1: Processed 5
Worker #2: Processed 4
Worker #3: Processed 6
work: thread blocked indefinitely in an STM transaction
(here I typed input, but the result is the same if I do nothing.)
By contrast the simpler `main` in the corresponding bit of the tutorial
text itself
(i.e.
https://github.com/Gabriel439/Haskell-Pipes-Concurrency-Library/blob/master/src/Pipes/Concurrent/Tutorial.hs#L220
) behaves as is advertised in the demo that follows in the text. I will see
if I can extract the salient difference.
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