Draft JEP: Primitive Types in Patterns, instanceof, and switch (Second Preview)

[Stephan Herrmann]

Thanks for clarifying.

FWIW ecj informs me:

The type parameter T should not be bounded by the final type Integer. Final 
types cannot be further extended

:)

Am 30.08.24 um 21:47 schrieb Brian Goetz:
> I had exactly the same confusion when I read those words.  Alex set me straight.
> 
>      <T extends Integer> int asInt(T t) { return t; }
> 
> Here, we go from T to Integer (a widening reference conversion), then to int (an 
> unboxing conversion).
> 
> On 8/30/2024 3:44 PM, Stephan Herrmann wrote:
>> The other day I stumbled upon this in the JLS changes for the first preview 
>> (JEP 455):
>>
>> * a widening reference conversion followed by an unboxing conversion
>> * a widening reference conversion followed by an unboxing conversion, then 
>> followed by a widening primitive conversion
>>
>> I fail to imagine any type that can be widened to a boxing type. What's going 
>> on here?
>>
>> best,
>> Stephan
>>
>>
>> Am 30.08.24 um 15:55 schrieb Angelos Bimpoudis:
>>> Dear experts,
>>>
>>> A draft JEP for the second preview of primitive types in patterns, 
>>> instanceof, and switch is now available. We propose to preview it for a 
>>> second time with no changes relative to JDK 23. This feature aligns what 
>>> instanceof and pattern matching mean across all types. This second preview, 
>>> unchanged, gives ample time to amber experts to express their feedback.
>>>
>>> https://bugs.openjdk.org/browse/JDK-8335876
>>>
>>> Let us know of your feedback.
>>>
>>> Thank you,
>>> Angelos
>>
>