[GHC] #14749: T13822 fails

[GHC]

#14749: T13822 fails
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        Reporter:  simonpj           |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"efce943ca20b55b18f948681e6b44fd892dbddd2/ghc"
 efce943c/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="efce943ca20b55b18f948681e6b44fd892dbddd2"
 Add -ddump-ds-preopt

 This allows you to see the output immediately after desugaring
 but before any optimisation.

 I've wanted this for some time, but I was triggered into action
 by Trac #13032 comment:9.

 Interestingly, the change means that with -dcore-lint we will
 now Lint the output before the very simple optimiser;
 and this showed up Trac #14749.  But that's not the fault
 of -ddump-ds-preopt!
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14749#comment:3>
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