fun valuesNotNull(map: MutableMap<Int, String>) {
    map.merge(1, "x") { old, new -> old + new }
        // SUCCESS
        // ORIGINAL:    fun merge(K, V & Any, BiFunction<in V & Any, in V & Any, out V?>): V? defined in kotlin.collections.MutableMap
        // SUBSTITUTED: fun merge(Int, String, BiFunction<in String, in String, out String?>): String? defined in kotlin.collections.MutableMap
}

fun valuesNullable(map: MutableMap<Int, String?>) {
    map.merge(1, "x") { old, new -> old + new }
        // SUCCESS
        // ORIGINAL:    fun merge(K, V & Any, BiFunction<in V & Any, in V & Any, out V?>): V? defined in kotlin.collections.MutableMap
        // SUBSTITUTED: fun merge(Int, String, BiFunction<in String, in String, out String?>): String? defined in kotlin.collections.MutableMap
    map.merge(1, null) { old, new -> old + new }
        // UNSAFE_CALL_ERROR
        // ORIGINAL:    fun merge(K, V & Any, BiFunction<in V & Any, in V & Any, out V?>): V? defined in kotlin.collections.MutableMap
        // SUBSTITUTED: fun merge(Int, String, BiFunction<in String, in String, out String?>): String? defined in kotlin.collections.MutableMap
}

fun <T> valuesT(map: MutableMap<Int, T>, newValue: T) {
    map.merge(1, newValue) { old, new -> null }
        // OTHER_ERROR
        // ORIGINAL:    fun merge(K, V & Any, BiFunction<in V & Any, in V & Any, out V?>): V? defined in kotlin.collections.MutableMap
        // SUBSTITUTED: fun merge(Int, T & Any, BiFunction<in T & Any, in T & Any, out T?>): T? defined in kotlin.collections.MutableMap
}

fun <T : Any> valuesTNotNull(map: MutableMap<Int, T>, newValue: T) {
    map.merge(1, newValue) { old, new -> null }
        // SUCCESS
        // ORIGINAL:    fun merge(K, V & Any, BiFunction<in V & Any, in V & Any, out V?>): V? defined in kotlin.collections.MutableMap
        // SUBSTITUTED: fun merge(Int, T, BiFunction<in T, in T, out T?>): T? defined in kotlin.collections.MutableMap
}

fun <T : Any> valuesTNullable(map: MutableMap<Int, T?>, newValue: T?) {
    map.merge(1, newValue) { old, new -> new }
        // UNSAFE_CALL_ERROR
        // ORIGINAL:    fun merge(K, V & Any, BiFunction<in V & Any, in V & Any, out V?>): V? defined in kotlin.collections.MutableMap
        // SUBSTITUTED: fun merge(Int, T & Any, BiFunction<in T & Any, in T & Any, out T?>): T? defined in kotlin.collections.MutableMap
    map.merge(1, newValue!!) { old, new -> new }
        // SUCCESS
        // ORIGINAL:    fun merge(K, V & Any, BiFunction<in V & Any, in V & Any, out V?>): V? defined in kotlin.collections.MutableMap
        // SUBSTITUTED: fun merge(Int, T & Any, BiFunction<in T & Any, in T & Any, out T?>): T? defined in kotlin.collections.MutableMap
}