Compiler crash building latest binary package in hackage with 7.0.1-rc1

My understanding is that the binary package should now be provided separately from the ghc-binary package. Unfortunately, it does not currently compile:

src/Data/Binary/Get.hs:366:27:
    Couldn't match type `s' with `s1'
      because this skolem type variable would escape: `s1'
    This skolem is bound by the polymorphic type `forall s. ST s a'
    The following variables have types that mention s
      first :: STRef s L.ByteString
               -> Int64
               -> L.ByteString
               -> ST s L.ByteString
        (bound at src/Data/Binary/Get.hs:373:9)
    In the first argument of `runST', namely
      `(do { r <- newSTRef undefined;
             xs <- first r i ps;
             ys <- unsafeInterleaveST (readSTRef r);
             return (xs, ys) })'
    In the expression:
      runST
        (do { r <- newSTRef undefined;
              xs <- first r i ps;
              ys <- unsafeInterleaveST (readSTRef r);
              return (xs, ys) })
    In an equation for `splitAtST':
        splitAtST i ps
          = runST
              (do { r <- newSTRef undefined;
                    xs <- first r i ps;
                    ys <- unsafeInterleaveST (readSTRef r);
                    return (xs, ys) })
          where
              first r 0 xs@(L.Chunk _ _) = writeSTRef r xs >> return L.Empty
              first r _ L.Empty = writeSTRef r L.Empty >> return L.Empty
              first r n (L.Chunk x xs)
                | n < l
                = do { writeSTRef r (L.Chunk (B.drop (fromIntegral n) x) xs);
                       .... }
                | otherwise
                = do { writeSTRef r (L.drop (n - l) xs);
                       .... }
                where
                    l = fromIntegral (B.length x)

Trac metadata

Trac field	Value
Version	7.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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