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Eric Seidel committed 79e7b98

fix mapAccumL when `f` maps Chars that fit in a single Word16 to Chars that require two

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File Data/Text/Fusion.hs

                                arr' <- A.new top'
                                A.copyM arr' 0 arr 0 top
                                outer arr' top' z s i
-                | otherwise -> do let (z',c) = f z x
-                                  d <- unsafeWrite arr i c
+                | otherwise -> do d <- unsafeWrite arr i c
                                   loop z' s' (i+d)
-                where j | ord x < 0x10000 = i
+                where (z',c) = f z x
+                      j | ord c < 0x10000 = i
                         | otherwise       = i + 1
 {-# INLINE [0] mapAccumL #-}