[cvs-nhc98] Show values of type IO as Abstract "IO".

olaf: Tue Apr 23 12:02:19 CEST 2002 Update of /usr/src/master/nhc/src/hat/lib In directory hinken:/tmp/cvs-serv12460/src/hat/lib Modified Files: Hat.hs TPreludeBuiltinTypes.hs Log Message: Show values of type IO as Abstract "IO". Values of type IO used to be of the form `hidden applied to lambda'. Showing Abstract IO instead is clearer (value of an abstract type) and does not contain less information. It is still possible to ask for the parent of Abstract IO.