Unexpected signal on hclosing stdout twice

Running 'hClose stdout' twice in a row causes Hugs to abort: Prelude> :l IO Reading file "/home/reid/local/lib/hugs/lib/IO.hs": Reading file "/home/reid/local/lib/hugs/lib/Ix.hs": Reading file "/home/reid/local/lib/hugs/lib/IO.hs": Hugs session for: /home/reid/local/lib/hugs/lib/Prelude.hs /home/reid/local/lib/hugs/lib/Ix.hs /home/reid/local/lib/hugs/lib/IO.hs IO> hPutStr stdout "abcde" >> hClose stdout abcde IO> hPutStr stdout "abcde" >> hClose stdout Unexpected signal -- Alastair Reid alastair@reid-consulting-uk.ltd.uk Reid Consulting (UK) Limited http://www.reid-consulting-uk.ltd.uk/alastair/