Some -> UClass (name = Some)
T -> [!] UnknownKotlinExpression (TYPE_PARAMETER)
Some -> USimpleNameReferenceExpression (identifier = Some)
T -> USimpleNameReferenceExpression (identifier = T)
test -> UMethod (name = test)
list -> UParameter (name = list)
List -> USimpleNameReferenceExpression (identifier = List)
Any -> USimpleNameReferenceExpression (identifier = Any)
    list -> USimpleNameReferenceExpression (identifier = list)
    filterIsInstance -> UCallExpression (kind = UastCallKind(name='method_call'), argCount = 0))
    Some -> USimpleNameReferenceExpression (identifier = Some)
    mapTo -> UCallExpression (kind = UastCallKind(name='method_call'), argCount = 2))
    mutableSetOf -> UCallExpression (kind = UastCallKind(name='method_call'), argCount = 0))
