actions := make(map[*analysis.Analyzer]*action)
	var registerFacts func(a *analysis.Analyzer) bool
	registerFacts = func(a *analysis.Analyzer) bool {
		act, ok := actions[a]
		if !ok {
			act = new(action)
			var usesFacts bool
			for _, f := range a.FactTypes {
				usesFacts = true
				gob.Register(f)
			}
			for _, req := range a.Requires {
				if registerFacts(req) {
					usesFacts = true
				}
			}