[GHC] #14321: -fsolve-constant-dicts is not very robust when dealing with GADTs

[GHC]

#14321: -fsolve-constant-dicts is not very robust when dealing with GADTs
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        Reporter:  mpickering        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9701             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 I'm not sure what you are expecting here.

 `isItSilly` tyepchecks and elaborates thus:
 {{{
 isItSilly (v::a) (Silly (d:: Ord a) (x::a)) = (<) d v x
 }}}
 It can't do anyting else.

 `isItSillyIntTA` is simply a call to `isItSilly`.  No dictionaries at all;
 solving constant dictionries doesn't arise.

 Ditto `isItSillyInt`.

 Look as if it's all behaving precisely as advertised.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14321#comment:1>
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