[GHC] #13876: Check 'pure' method of 'Applicative (WrappedMonad m)'

[GHC]

#13876: Check 'pure' method of 'Applicative (WrappedMonad m)'
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      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 RyanGlScott):

 It's useful since you often want to define `(<*>)` in terms of `(>>=)`.
 I'm putting this in a distinct category of retrofitted things from
 defining `return` from `pure`, since the latter is completely trivial
 (`return = pure`), whereas the former requires a tad more work.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13876#comment:7>
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