freebsd-skq/contrib/bmake/unit-tests/ternary

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all:
@for x in "" A= A=42; do ${.MAKE} -f ${MAKEFILE} show $$x; done
show:
@echo "The answer is ${A:?known:unknown}"
@echo "The answer is ${A:?$A:unknown}"
@echo "The answer is ${empty(A):?empty:$A}"