[GHC] #9896: panic: wrongKindOfFamily

17 Dec 2014


      #9896: panic: wrongKindOfFamily
-------------------------------------+-------------------------------------
       Reporter:  luite              |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Compiler           |                 Version:  7.9
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:
     Blocked By:                     |  None/Unknown
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 The following code panics with GHC HEAD:

 {{{#!hs
 {-# LANGUAGE TypeFamilies #-}

 class Test a where
   type TestT a :: *

 instance Test Bool where
   newtype TestT Bool = Int
 }}}

 {{{
 $ ghc Panic2.hs
 [1 of 1] Compiling Main             ( Panic2.hs, Panic2.o )

 Panic2.hs:7:3:ghc.exe: panic! (the 'impossible' happened)
   (GHC version 7.9.20141217 for i386-unknown-mingw32):
         wrongKindOfFamily TestT

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
 }}}

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9896
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