[GHC] #10853: Refine addTopDecls

[GHC]

#10853: Refine addTopDecls
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        Reporter:  goldfire          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Template Haskell  |              Version:  7.10.2
      Resolution:                    |             Keywords:
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 goldfire):

 It turns out that my proposal to change the treatment of regions is a bad
 idea. This is because `addTopDecls` is useful for generating new
 definitions that get used right away. If region D isn't available when
 type-checking region A, this isn't possible. Note that the fact that
 region D isn't available when ''renaming'' A is OK, as Template Haskell
 can use "exact" names.

 But this still could be cleaned up.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10853#comment:4>
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