UFile (package = )
    UClass (name = NonTrivialIdentifiersKt)
        UMethod (name = main)
            UParameter (name = a)
            [!] UnknownKotlinExpression (BLOCK)
    UClass (name = A)
        UMethod (name = A)
        UMethod (name = invoke)
            [!] UnknownKotlinExpression (BLOCK)
        UMethod (name = invoke)
            UParameter (name = f)
            [!] UnknownKotlinExpression (BLOCK)
