func replaceSequenceLabel(target *core.BuildTarget, label core.BuildLabel, in string, runnable, multiple, dir, outPrefix, hash, test, allOutputs bool) string {
// Check this label is a dependency of the target, otherwise it's not allowed.
if label == target.Label { // targets can always use themselves.
return checkAndReplaceSequence(target, target, in, runnable, multiple, dir, outPrefix, hash, test, allOutputs, false)
}
deps := target.DependenciesFor(label)
if len(deps) == 0 {
panic(fmt.Sprintf("Rule %s can't use %s; doesn't depend on target %s", target.Label, in, label))
}
// TODO(pebers): this does not correctly handle the case where there are multiple deps here
// (but is better than the previous case where it never worked at all)
return checkAndReplaceSequence(target, deps[0], in, runnable, multiple, dir, outPrefix, hash, test, allOutputs, target.IsTool(label))
}