[GHC] #8221: Type checker hangs

[GHC]

#8221: Type checker hangs
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        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:
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:4db3679cc36f346f44d84d8b1a8ad2d43f4b47e3/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="4db3679cc36f346f44d84d8b1a8ad2d43f4b47e3"
 Put the interface-file typechecking of IfUnpackCo inside forkM

 Now that IfBangs can contain coercions, which can mention the
 very type being typechecked, the tc_strict call must be inside
 forkM. This led to Trac #8221
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8221#comment:5>
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