[cvs-nhc98] 'isAlphaNum' wibble for pre-H'98 hbc build.

malcolm: Mon Feb 12 16:52:27 CET 2001 Update of /usr/src/master/nhc/src/compiler98 In directory hinken:/tmp/cvs-serv17016 Modified Files: PrettySyntax.hs Log Message: 'isAlphaNum' wibble for pre-H'98 hbc build.