[GHC] #14125: Bogus unacceptable type in foreign declaration.

[GHC]

#14125: Bogus unacceptable type in foreign declaration.
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        Reporter:  winter            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.2
       Component:  Compiler (FFI)    |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * cc: simonpj (added)
 * milestone:   => 8.2.2


Comment:

 So the commit that broke the program in item (1) in comment:2 is
 3540d1e1a23926ce0a8a6ae83a36f5f6b2497ccf (`Avoid exponential blowup in
 FamInstEnv.normaliseType`). It's a fairly small commit, so I'm hoping that
 staring at the diff will reveal what changed to cause the program to go
 wrong.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14125#comment:3>
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