foo -> UMethod (name = foo)
bar -> UParameter (name = bar)
String -> [!] UnknownKotlinExpression (REFERENCE_EXPRESSION)
String -> [!] UnknownKotlinExpression (REFERENCE_EXPRESSION)
bar -> UMethod (name = bar)
baz -> UMethod (name = baz)
String -> [!] UnknownKotlinExpression (REFERENCE_EXPRESSION)
    foo -> [!] UnknownKotlinExpression (CALL_EXPRESSION)
    ?: -> [!] UnknownKotlinExpression (OPERATION_REFERENCE)
    foo -> [!] UnknownKotlinExpression (CALL_EXPRESSION)
    ?: -> [!] UnknownKotlinExpression (OPERATION_REFERENCE)
    bar -> [!] UnknownKotlinExpression (CALL_EXPRESSION)
    toString -> [!] UnknownKotlinExpression (CALL_EXPRESSION)
