[GHC] #9938: cryptarithm2 fails with undefined reference to `transzuH9c1w14lEUN3zzdWCTsn8jG_ControlziMonadziTransziStateziLazzy_zdwzdcp0Alternative_info'

[GHC]

#9938: cryptarithm2 fails with undefined reference to
`transzuH9c1w14lEUN3zzdWCTsn8jG_ControlziMonadziTransziStateziLazzy_zdwzdcp0Alternative_info'
-------------------------------------+-------------------------------------
        Reporter:  nomeata           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------

Comment (by rwbarton):

 I'm confused, isn't your minimized test case showing the expected
 behavior? GHC doesn't really know what's in `Main.o` and that it needs to
 link against transformers, so you have to specify `-package transformers`
 at link time.

 I don't understand how changing the order of the cases in `solve` could
 affect anything, and I also can't reproduce it here.

 Not sure what is going on with cryptarithm2 then, did it somehow gain a
 link-time dependency on transformers (whereas previously, perhaps, all the
 functions in transformers had been inlined)?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9938#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler