Re: [GHC] #10216: Allow arr ∧ (first ∨ (***)) as minimal definition of Arrow instance

[GHC]

#10216: Allow arr ∧ (first ∨ (***)) as minimal definition of Arrow instance
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        Reporter:  strake888         |                   Owner:  ekmett
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Core Libraries    |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Description changed by strake888:

Old description:



New description:

 Add default definitions of `first`, `second` in terms of `(***)` to let
 one define an `Arrow` instance in terms of `(***)` rather than `first`,
 which is sometimes more elegant.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10216#comment:5>
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