[GHC] #12648: Stack overflow when using monad-unlift

[GHC]

#12648: Stack overflow when using monad-unlift
-------------------------------------+-------------------------------------
        Reporter:  nh2               |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Compile-time      |            Test Case:
  crash                              |  typecheck/should_fail/T12648
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  new => closed
 * testcase:   => typecheck/should_fail/T12648
 * resolution:   => fixed


Comment:

 Fortunately, commit ce97b7298d54bdfccd9dcf366a69c5617b4eb43f (Expand given
 superclasses more eagerly) happened to fix this bug, and it made it in
 time for GHC 8.0.2. To be on the safe side, I've added a regression test
 as well.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12648#comment:3>
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