1make: "varmod-assign-shell.mk" line 28: warning: "echo output; false" returned non-zero status 2Global: _ = # (empty) 3Var_Parse: ${ASSIGNED::!=echo output; ${:Ufalse}} (eval-keep-dollar-and-undefined) 4Evaluating modifier ${ASSIGNED::...} on value "previous" (eval-keep-dollar-and-undefined, regular) 5Modifier part: "echo output; false" 6Capturing the output of command "echo output; false" 7make: "echo output; false" returned non-zero status 8Result of ${ASSIGNED::!=echo output; ${:Ufalse}} is "" (eval-keep-dollar-and-undefined, regular) 9Global: _ = # (empty) 10Global: .MAKEFLAGS = -r -k -d v -d 11Global: .MAKEFLAGS = -r -k -d v -d 0 12DIRECT=output 13ASSIGNED=previous 14exit status 0 15