Global: ASSIGNED = value
Global: SUBST = # (empty)
Global: SUBST = value
Var_Parse: y(ASSIGNED) (eval)
Var_Parse: $U (eval-defined-loud)
make: opt-debug-var.mk:34: Variable "U" is undefined
Var_Parse: $< (eval-defined-loud)
make: opt-debug-var.mk:40: Variable "<" is undefined
Global: .MAKEFLAGS =  -r -k -d v -d
Global: .MAKEFLAGS =  -r -k -d v -d 0
make: Fatal errors encountered -- cannot continue
make: stopped in unit-tests
exit status 1