[GHC] #11628: Unexpected results with Read/Show

[GHC]

#11628: Unexpected results with Read/Show
-------------------------------------+-------------------------------------
        Reporter:  crockeea          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 What exactly is the bug here?  What does not work that you expect to work?
 What does "does not work" mean?  (Compile time error? Run time crash? Run
 time success but data printed does not look right?)

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11628#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler