Don't throw away bctest's error messages.

test_bn:

	@echo starting big number library test, could take a while...

	@./$(BNTEST) >tmp.bntest

	-@./$(BNTEST) >tmp.bntest

	@echo quit >>tmp.bntest

	@echo "running bc"

	@<tmp.bntest sh -c "`sh ./bctest`" 2>&1 | $(PERL) -e '$$i=0; while (<STDIN>) {if (/^test (.*)/) {print STDERR "\nverify $$1";} elsif (!/^0$$/) {die "\nFailed! bc: $$_";} else {print STDERR "."; $$i++;}} print STDERR "\n$$i tests passed\n"'

	@<tmp.bntest sh -c "`sh ./bctest`" | $(PERL) -e '$$i=0; while (<STDIN>) {if (/^test (.*)/) {print STDERR "\nverify $$1";} elsif (!/^0$$/) {die "\nFailed! bc: $$_";} else {print STDERR "."; $$i++;}} print STDERR "\n$$i tests passed\n"'

	@echo 'test a^b%c implementations'

	./$(EXPTEST)