[cvs-nhc98] Fix field update bug in trusted transformation.

olaf: Fri Jul 19 15:28:25 CEST 2002 Update of /usr/src/master/nhc/src/hat/trans In directory hinken:/tmp/cvs-serv20164/src/hat/trans Modified Files: TraceTrans.hs Log Message: Fix field update bug in trusted transformation. Any field update caused a Prelude.undefined error, because the transformation checks that a combinator of the desired arity exists. The untrusted update combinator does not have an arity. Pretending that it has arity -1 solves the problem.