1make: In the :@ modifier, the variable name "${:Ubar:S,b,v,}" must not contain a dollar
2          while evaluating variable "VAR" with value "value"
3          in command "@echo ${VAR:Uvalue:@${:Ubar:S,b,v,}@x${var}y@:Q}"
4          in target "mod-loop-varname"
5exit status 2
6