make: varmod-loop-varname.mk:17: In the :@ modifier, the variable name "${:Ubar:S,b,v,}" must not contain a dollar
	while evaluating "${:Uone two three:@${:Ubar:S,b,v,}@+${var}+@} != "+one+ +two+ +three+"" with value "one two three"
make: varmod-loop-varname.mk:87: In the :@ modifier, the variable name "v$" must not contain a dollar
	while evaluating variable "1 2 3" with value "1 2 3"
make: varmod-loop-varname.mk:93: In the :@ modifier, the variable name "v$$" must not contain a dollar
	while evaluating variable "1 2 3" with value "1 2 3"
make: varmod-loop-varname.mk:99: In the :@ modifier, the variable name "v$$$" must not contain a dollar
	while evaluating variable "1 2 3" with value "1 2 3"
make: Fatal errors encountered -- cannot continue
make: stopped making "all" in unit-tests
exit status 1