Adjust to the moving target called the C++ standard. Apparently nowadays it's not allowed to define an explicit copy constructor but not an assignment operator. Consequently, defining the explicit copy constructor in terms of the implicit/automatic assignment operator for general convenience no longer works. Add assignment operators. Caution: not tested with the IBM compiler, but there's no particular reason it shouldn't work.

# jrc.syn 
SYNS=ct.syn ex.syn krc.syn mas.syn ts.syn
SRCS=mpp.cpp token.cpp \
	./ct.cpp ./ex.cpp ./krc.cpp ./mas.cpp ./ts.cpp

PROG=krc
INCDIRS=. $(TOP)/examples/mpp $(TOP)/oldclasslib/include
MYLIBS=$(BUILDTOP)/oldclasslib/source/oldclasslib$(LIBEXT)
AGFILEDEST=here
THISEXAMPLE=mpp

include $(TOP)/mk/prog.mk
include $(TOP)/mk/installexample.mk