Warning about single underscore identifier

[Paul Benedict]

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