[GHC] #10105: ghc panic Simplifier ticks exhausted when trying UnfoldingDone x_alB

[GHC]

#10105: ghc panic Simplifier ticks exhausted when trying UnfoldingDone x_alB
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        Reporter:  dramforever       |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1-rc2
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by dramforever):

 Oh yes. Actually I knew that before but in this case it just says "panic"
 rather than looping so I thought it was irrlevant.

 Maybe fix the docs?

 Also an idea: Maybe we can do positivity analysis on data types just like
 Agda. We don't have to refuse it, just add a check when compiling
 functions that deal with it (and maybe a warning?)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10105#comment:3>
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