Warning about single underscore identifier

[Brian Goetz]

No.  The EG specifically discussed this and decided to stop at _.  

On Aug 1, 2013, at 6:54 AM, Paul Benedict wrote:

> Personally, I hope so. It would be nice to retain $ for the JVM but exclude
> it from the Java language. (I've read some interesting Eclipse tickets
> about that symbol over the years.)
> 
> 
> On Thu, Aug 1, 2013 at 7:57 AM, Matthew Adams <matthew at matthewadams.me>wrote:
> 
>> Brian, will the same policy hold for "$"?
>> 
>> -matthew
>> 
>> 
>> On Wed, Jul 31, 2013 at 1:52 PM, Brian Goetz <brian.goetz at oracle.com>
>> wrote:
>> 
>>> Yes, we are "reclaiming" the syntactic real estate of "_" from the space
>>> of identifiers for use in future language features.  However, because
>> there
>>> are existing programs that might use it, it is a warning for identifiers
>>> that occur in existing syntactic positions for 8, and an error for lambda
>>> formals (since there is no existing code with lambdas.)
>>> 
>>> Your suspicion is mostly right, except that we are certainly NOT going to
>>> do Scala's "wunderbar".  However, things it might be used for include
>>> things like "I don't want to give this variable a name" (such as catch
>>> parameters that are never used.)
>>> 
>>> 
>>> On Jul 29, 2013, at 6:59 AM, Roel Spilker wrote:
>>> 
>>>> Hi all,
>>>> 
>>>> If I compile a java program containing an identifier consisting of
>> just a
>>>> single underscore using the java 8 compiler, I get the following
>> warning:
>>>> 
>>>> warning: '_' used as an identifier
>>>> (use of '_' as an identifier might not be supported in releases after
>>> Java
>>>> SE 8)
>>>> 
>>>> I suspect this is to allow for scalaesc parameters in lambdas.
>>>> 
>>>> Can someone confirm my suspicion? Is this still relevant or is this a
>>>> left-over from an early design? Is there a valid reason to not support
>>> '_'
>>>> for all identifiers, or can it be only restricted for identifiers
>> inside
>>>> lambdas, and therefore guaranteed new code, to maintain backwards
>> source
>>>> compatibility.
>>>> 
>>>> Roel
>>>> 
>>> 
>>> 
>>> 
>> 
>> 
>> --
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>> 
>> 
> 
> 
> -- 
> Cheers,
> Paul
>