String workType
        String cacheableAnnotation
        List<String> otherAnnotations = []

        NotCacheableWithoutReason(ValidationMessageChecker checker) {
            super(checker)
        }

        NotCacheableWithoutReason noReasonOnTask() {
            workType = "task"
            cacheableAnnotation = "@CacheableTask"

        def externalExecution = executions.find { it.details.identity == externalTransformIdentification.identity }
        [projectExecution, externalExecution].each {
            with(it) {
                details.workType == 'TRANSFORM'
            }
        }

        with(projectExecution.result) {
            skipMessage == null
            originBuildInvocationId == null

	// fractional worker isn't behind again the instant it exits.
	return float64(selfTime)/float64(delta) > 1.2*gcController.fractionalUtilizationGoal
}

var work workType

type workType struct {
	full  lfstack          // lock-free list of full blocks workbuf
	_     cpu.CacheLinePad // prevents false-sharing between full and empty
	empty lfstack          // lock-free list of empty blocks workbuf

        assert executeWorkOps.size() == skipMessages.size()
        [executeWorkOps, skipMessages].transpose().every { op, skipMessage ->
            verifyAll(op) {
                details.workType == "TRANSFORM"
                result.skipMessage == skipMessage
            }
        }
    }