[GHC] #11767: Add @since annotations for base instances

[GHC]

#11767: Add @since annotations for base instances
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        Reporter:  bgamari           |                Owner:  seraphime
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Core Libraries    |              Version:  7.10.3
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11768            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by seraphime):

 I have already written a script that seeks out the first commit in the git
 history where the instance appears, compares its timestamp to stamps which
 correspond to version bumps ( I found those by reading the commit history
 ). Comparison in the script is done on a single file, so files containing
 the same instance declaration will not disturb each other.

 However, I couldn't find any indications about the release dates of
 versions before 2.01. Should the annotation specify something like "<=
 2.01" or there is some way to find out their respective release dates ?

 For instances I cannot check in the link you gave, can I trust the logs ?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11767#comment:6>
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