Make Data.{Bifoldable,Bitraversable} -XSafe

Test Plan: Previously, `Data.{Bifoldable,Bitraversable}` were being inferred as `Unsafe` due to a transitive `Data.Coerce` import from `Data.Functor.Utils`. This rectifies this unfortunate mistake. Reviewers: austin, hvr, bgamari Reviewed By: bgamari Subscribers: thomie, phadej Differential Revision: https://phabricator.haskell.org/D2412
ghc · Jul 20, 2016 · e46b768 · e46b768
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diff --git a/libraries/base/Data/Bifoldable.hs b/libraries/base/Data/Bifoldable.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE Safe #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 
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diff --git a/libraries/base/Data/Bitraversable.hs b/libraries/base/Data/Bitraversable.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE Safe #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Data.Bitraversable

diff --git a/libraries/base/Data/Functor/Utils.hs b/libraries/base/Data/Functor/Utils.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE Trustworthy #-}
 {-# LANGUAGE NoImplicitPrelude #-}
 
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