I guess you entered a black hole! :-)

The problem is that don't understand black holes myself, I just got introduced with the same thing yesterday :-) I confused me a lot too.

The only explanation I could give you intuitively is that GHCi is running in multi threaded execution mode, and that two or more execution threads are waiting for each other forever, creating a "deadlock".

http://www.haskell.org/ghc/docs/2.10/users_guide/user_146.html seems to confirm that?

If you try the same using (Win)HUGS, you'll get 100% CPU time usage.

Cheers,
Peter Verswyvelen

Pasqualino 'Titto' Assini wrote:

Hi,

if I define:

f = f

and then try to evaluate 'f'  in GHCi, as one would expect, the interpreter 
never returns an answer.

The funny thing is that, while it is stuck in an infinite loop, GHCi doesn't 
seem to use any CPU time at all.

How is this possible?

Thanks

            titto






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