Re: [GHC] #9858: Typeable instances should be kind-aware

17 Dec 2015

      #9858: Typeable instances should be kind-aware
-------------------------------------+-------------------------------------
        Reporter:  dreixel           |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  highest           |            Milestone:  7.10.2
       Component:  Compiler          |              Version:  7.9
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  typecheck/should_fail/T9858a,b,c;
                                     |  should_run/T9858b
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D652,
       Wiki Page:                    |  Phab:D757
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * differential:  Phab:D652 => Phab:D652, Phab:D757

Old description:
...
{{{
{-# LANGUAGE DataKinds              #-}
{-# LANGUAGE AutoDeriveTypeable     #-}
import Data.Typeable
data A = A
main = print $ typeRep (Proxy :: Proxy A) == typeRep (Proxy :: Proxy 'A)
}}}
This returns `True`, but it should return `False`.
New description:

 {{{#!hs
 {-# LANGUAGE DataKinds              #-}
 {-# LANGUAGE AutoDeriveTypeable     #-}

 import Data.Typeable

 data A = A

 main = print $ typeRep (Proxy :: Proxy A) == typeRep (Proxy :: Proxy 'A)
 }}}

 This returns `True`, but it should return `False`.

--

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9858#comment:118
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