[GHC] #15305: Erroneous "non-exhaustive pattern match" using nested GADT with strictness annotation

[GHC]

#15305: Erroneous "non-exhaustive pattern match" using nested GADT with strictness
annotation
-------------------------------------+-------------------------------------
        Reporter:  jkoppel           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler (Type    |              Version:  8.4.3
  checker)                           |             Keywords:
      Resolution:                    |  PatternMatchWarnings
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 Good point.

 Pattern-match coverage checking sorely needs a champion: someone who is
 willing to take ownership of the code (which is in only one module!) and
 give it love and care.

 There are a lot of open tickets: see
 [https://ghc.haskell.org/trac/ghc/wiki/PatternMatchCheck this summary wiki
 page]

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15305#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler