Bug in hugs98-990222-all/lib/Monad.hs and hugs98-990222-all/lib/Prelude.hs rsp.

[Guenter Huebel]

hugs98-990222-all/lib/Monad.hs
uses
    accumulate, sequence
but in
  hugs98-990222-all/lib/Prelude.hs
are changed from
  hugs98-980121-all/lib/Prelude.hs
     accumulate  to sequence
 and
     sequence  to  sequence_

What's wrong?