make: Bad conditional expression `variable expression == "literal"' in variable expression == "literal"?bad:bad
make: "varmod-ifelse.mk" line 27: Malformed conditional (${${:Uvariable expression} == "literal":?bad:bad})
make: Bad conditional expression ` == ""' in  == ""?bad-assign:bad-assign
make: Bad conditional expression ` == ""' in  == ""?bad-cond:bad-cond
make: "varmod-ifelse.mk" line 44: Malformed conditional (${${UNDEF} == "":?bad-cond:bad-cond})
make: Bad conditional expression `1 == == 2' in 1 == == 2?yes:no
make: "varmod-ifelse.mk" line 66: Malformed conditional (${1 == == 2:?yes:no} != "")
CondParser_Eval: "${1 == == 2:?yes:no}" != ""
CondParser_Eval: 1 == == 2
lhs = 1.000000, rhs = 0.000000, op = ==
make: Bad conditional expression `1 == == 2' in 1 == == 2?yes:no
lhs = "", rhs = "", op = !=
make: "varmod-ifelse.mk" line 92: warning: Oops, the parse error should have been propagated.
CondParser_Eval: ${ ${:U\$}{VAR} == value :?ok:bad} != "ok"
CondParser_Eval: ${VAR} == value 
lhs = "value", rhs = "value", op = ==
lhs = "ok", rhs = "ok", op = !=
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1