[GHC] #8132: Warning for Typeable instances misplaced

[GHC]

#8132: Warning for Typeable instances misplaced
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        Reporter:  scottgw                       |            Owner:
            Type:  bug                           |  dreixel
        Priority:  normal                        |           Status:  new
       Component:  Compiler                      |        Milestone:
      Resolution:                                |          Version:  7.7
Operating System:  Unknown/Multiple              |         Keywords:
 Type of failure:  Incorrect warning at          |     Architecture:
  compile-time                                   |  Unknown/Multiple
       Test Case:                                |       Difficulty:
        Blocking:                                |  Unknown
                                                 |       Blocked By:
                                                 |  Related Tickets:
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Comment (by scottgw):

 Well, assuming hand-coding {{{Typeable}}} instances is just as dangerous
 as it was last release, then the first option is more appropriate. It will
 allow more people to quickly move to 7.8 and find all the nasty bugs/great
 features, which is what I guess everyone wants.

 In this case, I would also keep {{{NewTypeable}}} in 7.10 as well, just
 re-exporting {{{Typeable}}}. Then packages don't have a hard partition
 between revisions and it gives maintainers a release to fix the 'typo'.
 Otherwise it makes the advice in 7.8 strange: the old {{{Data.Typeable}}}
 is being deprecated, please use the (deprecated) {{{Data.NewTypeable}}}.
 The churn will be constant in either case, but this keeps the user-facing
 breakages down.

 I would be happy to help make the changes as well, if someone were to
 point me to the relevant places.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8132#comment:8>
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