}
		return nil, fmt.Errorf("failed to run `%s %s`: %v", cmd, strings.Join(args, " "), message)
	}

	packages, err := decodePackages(bytes.NewReader(stdout))
	if err != nil {
		return nil, fmt.Errorf("failed to decode packages: %v", err)
	}

	return packages, nil
}

func decodePackages(r io.Reader) ([]Package, error) {
	// `go list -json` concatenates package definitions