nixpkgs/pkgs/development/compilers/ghcjs/patches/vector-ghcjs-storable-set.patch

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diff --git a/Data/Vector/Storable/Mutable.hs b/Data/Vector/Storable/Mutable.hs
index 8b538bc..2b74fce 100644
--- a/Data/Vector/Storable/Mutable.hs
+++ b/Data/Vector/Storable/Mutable.hs
@@ -197,7 +197,9 @@ storableSet (MVector n fp) x
1 -> storableSetAsPrim n fp x (undefined :: Word8)
2 -> storableSetAsPrim n fp x (undefined :: Word16)
4 -> storableSetAsPrim n fp x (undefined :: Word32)
+#if !defined(ghcjs_HOST_OS)
8 -> storableSetAsPrim n fp x (undefined :: Word64)
+#endif
_ -> unsafeWithForeignPtr fp $ \p -> do
poke p x