`HashMap.putAll` threw the following exception (line 305): `IllegalStateException: This cannot happe...

# kotlin-native

[Sam Stone]

HashMap.putAll threw the following exception (line 305): IllegalStateException: This cannot happen with fixed magic multiplier and grow-only hash array. Have object hashCodes changed?
The function that threw this exception:

data class Foo(
    val a: List<Int>
)
val map = hashMapOf<Foo>()
fun populateMap(item: Wrapper<Foo>) {
    map.clear()
    map.putAll(item.foo.a)
}