clarified workaround: problem is potential blocking of vacuous input (see also Poly/ML SVN 1874);
clarified workaround: problem is potential blocking of vacuous input (see also Poly/ML SVN 1874);

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle