UFile (package = )
    UClass (name = DefaultParameterValuesKt)
        UMethod (name = foo)
            UParameter (name = a)
                [!] UnknownKotlinExpression (INTEGER_CONSTANT)
            UParameter (name = foo)
                [!] UnknownKotlinExpression (NULL)
            [!] UnknownKotlinExpression (BLOCK)
