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Add Monad instances to (,,) a b and (,,,) a b c

Fumiaki Kinoshita requested to merge fumieval/ghc:more-instances into master

Original discussion: https://mail.haskell.org/pipermail/libraries/2017-March/thread.html#27919

Thank you for your contribution to GHC!

Please take a few moments to verify that your commits fulfill the following:

  • are either individually buildable or squashed
  • have commit messages which describe what they do (referring to Notes and tickets using #NNNN syntax when appropriate)
  • [v] have added source comments describing your change. For larger changes you likely should add a Note and cross-reference it from the relevant places.
  • add a testcase to the testsuite.

If you have any questions don't hesitate to open your merge request and inquire in a comment. If your patch isn't quite done yet please do add prefix your MR title with WIP:.

Edited by Fumiaki Kinoshita

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