replaced File.sysify_path by Path.pack; avoid "handle _" (which is not well-defined due to erratic Interrupt exceptions);
replaced File.sysify_path by Path.pack;
avoid "handle _" (which is not well-defined due to erratic Interrupt exceptions);

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