[GHC] #7730: :info and polykinds

[GHC]

#7730: :info and polykinds
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        Reporter:  monoidal                 |            Owner:  archblob
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:  7.8.1
       Component:  Compiler (Type checker)  |          Version:  7.6.2
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  None/Unknown             |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:  #8776
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Comment (by simonpj):

 Replying to [comment:13 archblob]:
 > Right now I'm exporting ``` pprIfaceDecl ``` from ``` IfaceSyn ``` and
 I've modified  it to look like this ``` pprIfaceDecl :: Maybe ShowSub ->
 IfaceDecl -> SDoc ``` this allows us to decide how we print things, if the
 first argument is ``` Nothing ``` we print ``` IfaceDecl ``` the old way.

 That sounds roughly right, but I'm not sure what you mean by "the old
 way".  Really `pprIfaceDecl` should simply behave like `ppr_ty_thing` does
 today.

 Re comment 14, the point is to combine the pretty printing not to
 complicate the duplicate code!  So let's not do that.

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7730#comment:15>
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