t.Errorf("VersionedOptions with IntroducedVersion %s must be less than RemovedVersion %v", vop.IntroducedVersion, vop.RemovedVersion)
			}
		}

		for _, name := range librariesInVersions(t, vop) {
			versionTracking, ok := tracked[name]
			if !ok {
				versionTracking = &versionTracker{}
				tracked[name] = versionTracking
			}
			if versionTracking.added != nil {