make: directive-ifmake.mk:14: ok: positive condition works
make: directive-ifmake.mk:26: ok: negation works
make: directive-ifmake.mk:36: ok: double negation works
make: directive-ifmake.mk:44: ok: both mentioned
make: directive-ifmake.mk:52: ok: only those mentioned
make: directive-ifmake.mk:63: Targets can even be added at parse time.
make: directive-ifmake.mk:82: ok
: first
: second
: late-target
make: don't know how to make !edge (continuing)

Stop.
make: stopped making "first second late-target !edge" in unit-tests
exit status 1