[ problems with concurrent Haskell ]
I can see two problems in your code:
* forkIO creates "daemon threads", so the program terminates immediately.
* Chan is an unbounded channel, so you won't get a "ping pong", which is probably what you expected. MVar is your friend here.
See http://haskell.org/ghc/docs/latest/html/base/Control.Concurrent.html
Cheers, S.
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