I'd like to use a contract to ensure that a Pair<K?, V> is treated as Pair<K, V>, but I ...

# getting-started

[Bernhard]

I'd like to use a contract to ensure that a Pair<K?, V> is treated as Pair<K, V>, but I can't get this to work

@OptIn(ExperimentalContracts::class)
internal fun <K, V> hasNonNullFirst(pair: Pair<K?, V>): Boolean {
    contract {
        returns(true) implies (pair is Pair<K, V>)
    }
    return pair.first != null
}

[dmitriy.novozhilov]

https://youtrack.jetbrains.com/issue/KT-45683

[Bernhard]

thank you!