[GHC] #14270: GHC HEAD's ghc-stage1 panics on Data.Typeable.Internal

[GHC]

#14270: GHC HEAD's ghc-stage1 panics on Data.Typeable.Internal
-------------------------------------+-------------------------------------
        Reporter:  hvr               |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14236            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"4bb54a4522d44a81b2c47233f48252bd73c38279/ghc"
 4bb54a45/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="4bb54a4522d44a81b2c47233f48252bd73c38279"
 Avoid creating dependent types in FloatOut

 This bug was exposed by Trac #14270.  The problem and its cure
 is described in SetLevels, Note [Floating and kind casts].

 It's simple and will affect very few programs.  But the very
 fact that it was so unexpected is discomforting.
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14270#comment:17>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler