[GHC] #10143: Separate PprFlags (used by Outputable) from DynFlags

[GHC]

#10143: Separate PprFlags (used by Outputable) from DynFlags
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        Reporter:  ezyang            |                Owner:  ezyang
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10961            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 I am confused about the goal here.  I thought the point of speparating out
 `PprFlags` is because pretty-printing only needs them, not lots of other
 `DynFlags` stuff.   The Descipriotn says "At the moment, SDoc computations
 have full access to the entirety of DynFlags, despite only a minusculely
 small amount of the data structure being relevant to them."

 But if pretty printing ''does'' require a "whole heap of other stuff from
 `DynFlags`", why not leave it all the way it is?

 Perhaps it would be worth elaborating the Description to explain a bit
 more about goal and motivation?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10143#comment:12>
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