make: "varmod-assign-shell.mk" line 27: warning: "echo output; false" returned non-zero status
Global: _ = 
Var_Parse: ${ASSIGNED::!=echo output; ${:Ufalse}} (eval-keep-dollar-and-undefined)
Evaluating modifier ${ASSIGNED::...} on value "previous" (eval-keep-dollar-and-undefined, regular)
Modifier part: "echo output; false"
Capturing the output of command "echo output; false"
make: "echo output; false" returned non-zero status
Result of ${ASSIGNED::!=echo output; ${:Ufalse}} is "" (eval-keep-dollar-and-undefined, regular)
Global: _ = 
Global: .MAKEFLAGS =  -r -k -d v -d
Global: .MAKEFLAGS =  -r -k -d v -d 0
DIRECT=output
ASSIGNED=previous
exit status 0