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--- a/Data/Digest/SHA2.hs
+++ b/Data/Digest/SHA2.hs
@@ -106,7 +106,7 @@
data Hash384 = Hash384 !Word64 !Word64 !Word64 !Word64 !Word64 !Word64 deriving (Eq, Ord)
data Hash224 = Hash224 !Word32 !Word32 !Word32 !Word32 !Word32 !Word32 !Word32 deriving (Eq, Ord)
-instance (Integral a) => Show (Hash8 a) where
+instance (Integral a, Show a) => Show (Hash8 a) where
showsPrec _ (Hash8 a b c d e f g h) =
(showHex a) . (' ':) .
(showHex b) . (' ':) .
@@ -146,7 +146,7 @@
where
bs = bitSize (head r)
-instance (Integral h, Bits h) => Hash (Hash8 h) where
+instance (Integral h, Bits h, Show h) => Hash (Hash8 h) where
toOctets (Hash8 x0 x1 x2 x3 x4 x5 x6 x7) = bitsToOctets =<< [x0, x1, x2, x3, x4, x5, x6, x7]
instance Hash Hash384 where
@@ -282,4 +282,4 @@
-- Test with:
-- ghc -no-recomp -O --make Data/Digest/SHA2.hs -main-is Data.Digest.SHA2.moduleTest -o moduleTest && ./moduleTest && rm moduleTest
-moduleTest = runTestTT test_sha2
\ No newline at end of file
+moduleTest = runTestTT test_sha2
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