[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:  quchen
            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 tibbe):

 Let me clarify what my concern here is: there are two ways to future proof
 your code against the upcoming export of `join` et al in 7.10:

  * Rename your local `join` function.
  * Hide the import from the `Prelude` (this is what the example above
 does).

 Both will work when 7.10 comes around.

 The problem is that the warning is overly trigger-happy; it warns if you
 go for option 2. Since people like to have warning free code, this means
 that in practice you have to go with the first option. There might be a
 good reason to have a function called `join` in your module, just like
 there might be a good reason to have a function called `map` (or any other
 `Prelude` name).

 I think the warning should be fixed such that it only happens if the code
 would actually break in 7.10.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8004#comment:16>
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