[GHC] #8221: Type checker hangs

[GHC]

#8221: Type checker hangs
----------------------------------------------+---------------------------
        Reporter:  maxs                       |            Owner:  dreixel
            Type:  bug                        |           Status:  new
        Priority:  highest                    |        Milestone:  7.8.1
       Component:  Compiler                   |          Version:  7.7
      Resolution:                             |         Keywords:  hangs
Operating System:  Unknown/Multiple           |     Architecture:  arm
 Type of failure:  GHC rejects valid program  |       Difficulty:  Unknown
       Test Case:                             |       Blocked By:
        Blocking:                             |  Related Tickets:
----------------------------------------------+---------------------------

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

 In [changeset:d3f002cc99b188d2e2ea9d43a9e0e4abb2116364/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="d3f002cc99b188d2e2ea9d43a9e0e4abb2116364"
 Fix over-eager unpacking in isUnpackableType

 This bug meant that we tried to unpack Link in

   data Link a = MkLink !(Link a)

 when -funbox-small-strict-fields was on.  See Trac #8221.
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8221#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler