[GHC] #8004: Applicative/Monad proposal related warnings (AMP phase 1)

[GHC]

#8004: Applicative/Monad proposal related warnings (AMP phase 1)
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        Reporter:  quchen            |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  high              |        Milestone:  7.8.1
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by quchen):

 Thanks for the helpful hint, Simon. Just before I found that tcg_insts is
 a good place to look at by successively printing everything in the global
 environment, and you confirmed that that promising field is indeed
 correct. Now I can stop worrying about whether I'm coding everything based
 on a false premise :-)

 As some sort of status report, I think the core functionality of issuing
 the Applicative/Monad warnings is done now (and therefore also
 Alternative/MonadPlus). What's still missing is making this dependent on
 compiler flags, printing proper line numbers, and of course the "warn on
 custom join/<*>/pure" issue. (I should also credit danr for implementing
 the most significant parts up to this point.)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8004#comment:8>
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