```// 1 fun matchUtterance(match: MatchResult): List<MatchResult> = alternatives.flatMap {...

# codereview

[Ellen Spertus]

// 1
fun matchUtterance(match: MatchResult): List<MatchResult> =
    alternatives.flatMap { pattern ->
        pattern.matchUtterance(match)
    } + if (empty) listOf<MatchResult>(match) else emptyList<MatchResult>()

or

// 2
fun matchUtterance(match: MatchResult): List<MatchResult> {
    val results = alternatives.flatMap { pattern ->
        pattern.matchUtterance(match)
    }
    return if (empty) results + listOf(match) else results
}