[GHC] #8091: retry# lacks strictness information

[GHC]

#8091: retry# lacks strictness information
-------------------------------------+-------------------------------------
        Reporter:  parcs             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by bgamari):

 Actually, comment:7 isn't quite right: The fact that `loop` doesn't
 diverge should be accounted for by the `ExnStr` of the first argument of
 `orElse`. I would have thought that the `ExnStr` should propagate to the
 second argument of `loop` during demand analysis but it doesn't. That
 seems to be the issue.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8091#comment:9>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler