Re: [GHC] #10481: raise# should have an open kind in its return type

4 Jun 2015


      #10481: raise# should have an open kind in its return type
-------------------------------------+-------------------------------------
        Reporter:  gridaphobe        |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * priority:  low => normal
 * milestone:   => 7.12.1


Comment:

 No, it can affect anyone:
 {{{
 {-# LANGUAGE MagicHash #-}
 module Foo where
 import GHC.Prim

 f :: Int -> Int#
 f x = raise# x
 }}}
 This wrongly yields
 {{{
     Kind incompatibility when matching types:
       b0 :: *
       Int# :: #
     In the expression: raise# x
     In an equation for ‘f’: f x = raise# x
 }}}

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10481#comment:1
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