}
		if len(data) == 0 {
			continue // no facts
		}
		var gobFacts []gobFact
		if err := gob.NewDecoder(bytes.NewReader(data)).Decode(&gobFacts); err != nil {
			return nil, fmt.Errorf("decoding facts for %q: %v", imp.Path(), err)
		}
		logf("decoded %d facts: %v", len(gobFacts), gobFacts)

		// Parse each one into a key and a Fact.
		for _, f := range gobFacts {