dev-haskell/classy-prelude: fix build failure, bug #575244

mono-traversable-0.9.3 introduces it's own intercalate.

Reported-by: Toralf Förster
Bug: https://bugs.gentoo.org/575244

Package-Manager: portage-2.2.27

dev-haskell/classy-prelude/classy-prelude-0.12.0.ebuild

@@ -45,3 +45,7 @@ DEPEND="${RDEPEND}
 	test? ( >=dev-haskell/hspec-1.3
 		dev-haskell/quickcheck )
 "
+
+src_prepare() {
+	epatch "${FILESDIR}"/${P}-mt-0.9.3.patch
+}

dev-haskell/classy-prelude/files/classy-prelude-0.12.0-mt-0.9.3.patch

@@ -0,0 +1,10 @@
+https://bugs.gentoo.org/575244
+diff --git a/ClassyPrelude.hs b/ClassyPrelude.hs
+index a6c0db4..27173aa 100644
+--- a/ClassyPrelude.hs
++++ b/ClassyPrelude.hs
+@@ -193,3 +193,3 @@ import Data.ChunkedZip
+ import qualified Data.Char as Char
+-import Data.Sequences hiding (elem)
++import Data.Sequences hiding (elem, intercalate)
+ import Data.MonoTraversable