Here is where I've heard of this :
https://github.com/javaslang/javaslang/issues/242
The summary is at
https://github.com/javaslang/javaslang/issues/242#issuecomment-102707841

Martin Grigorov
Wicket Training and Consulting
https://twitter.com/mtgrigorov

On Fri, Oct 16, 2015 at 7:55 PM, Dan Haywood <[email protected]>
wrote:

> Yes, I saw a message about that, for a single underscore... which is why I
> changed to a double underscore.
>
> Do we think that that's a bad idea too?  I kind of like the concept of a
> "default" name somehow.
>
> On 16 October 2015 at 18:46, Martin Grigorov <[email protected]> wrote:
>
> > Hi Dan,
> >
> > On Fri, Oct 16, 2015 at 7:29 PM, <[email protected]> wrote:
> >
> > > +For the case where there is only a single member being contributed,
> the
> > > special name "__" (that is, two underscores)
> > > +can be used instead.  In this case, the contributee member's name will
> > be
> > > inferred from the mixin's class name.  If the
> > > +class name itself contains an underscore, then the last part of the
> > class
> > > name will be used.
> > >
> >
> > AFAIK usage of underscore as a prefix in names (and especially two
> > consecutive underscores) is is kind of deprecated in Java 8 and most
> > probably won't compile in Java 9.
> > I think I've seen IDEA 14+ to log compilation warnings when such a
> > detected.
> >
> > I remember seeing a answer by Brian Goetz somewhere but I cannot find it
> > now.
> > Here is an answer in SO: http://stackoverflow.com/a/23525446/497381
> >
> >
> > Martin Grigorov
> > Wicket Training and Consulting
> > https://twitter.com/mtgrigorov
> >
>

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