[GHC] #7697: (=>) works on non-constraints

[GHC]

#7697: (=>) works on non-constraints
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Reporter:  monoidal                     |          Owner:                  
    Type:  bug                          |         Status:  new             
Priority:  normal                       |      Component:  Compiler        
 Version:  7.6.2                        |       Keywords:                  
      Os:  Unknown/Multiple             |   Architecture:  Unknown/Multiple
 Failure:  GHC accepts invalid program  |      Blockedby:                  
Blocking:                               |        Related:                  
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Comment(by simonpj@…):

 commit 24a0e442ed928e363c594c6389a72852b393b3f9
 {{{
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Sun Mar 3 22:49:23 2013 +0000

     Make sure that Constraint is unrelated to other kinds in tcIsSubKind

     This was causing the bug reported in Trac #7697

  compiler/types/Kind.lhs |    9 +++++++--
  1 files changed, 7 insertions(+), 2 deletions(-)
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7697#comment:1>
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