[cvs-nhc98] Corrected IO for tracing.

olaf: Fri Jun 29 19:25:08 CEST 2001 Update of /usr/src/master/nhc/src/prelude/IO In directory hinken:/tmp/cvs-serv14691 Modified Files: HGetChar.hs HGetContents.hs HPutChar.hs Log Message: Corrected IO for tracing. In tracing cafs that read input always returned the same input and hence even getLine didn't work. This was because of insufficient threading of the world. Now it works.