Summary: Carl Howells pointed out that the `Monoid` instance for `Data.Proxy.Proxy` is only defined for types with kind *. This is a very mild change. Furthermore, Edward Kmett revealed that it was supposed to be there all along -- the extension simply got lost in commit 1d1ff77a, as pointed out by Adam Vogt. This used to be correct in GHC 7.6, so this commit fixes a regression. This addresses #9317.  <http://www.haskell.org/pipermail/libraries/2014-July/023261.html>.  <http://www.haskell.org/pipermail/libraries/2014-July/023267.html>.  <http://www.haskell.org/pipermail/libraries/2014-July/023265.html >. Signed-off-by: Alexander Berntsen <email@example.com> Test Plan: See  Reviewers: austin, hvr, ekmett Reviewed By: austin, hvr, ekmett Subscribers: phaskell, simonmar, relrod, carter Differential Revision: https://phabricator.haskell.org/D7018b2c467
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