[GHC] #12161: Panic when literal is coerced into function

[GHC]

#12161: Panic when literal is coerced into function
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        Reporter:  ezyang            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  lowest            |            Milestone:  ⊥
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #2864             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 You definitely can't coerce an unboxed `Int#` into a polymorphic type
 variable `a`.  See [http://hackage.haskell.org/package/ghc-
 prim-0.5.0.0/docs/GHC-Prim.html#v:unsafeCoerce-35- the rules for
 unsafeCoerce].

 Still, it really should not make GHC crash outright.   If someone wants to
 dig in and fix, I can advise.  But given that the program is so wrong, it
 doesn't seem that important.

 Mind you, it'd be good if Core Lint checked those rules for
 `unsafeCoerce`....

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12161#comment:2>
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