bug#24780: 26.0.50; describe-mode lexical-binding

[Drew Adams]

> >> Even displaying it in mode-line might be an option.
> >
> > That does sound more useful -- I often find jumping back to the start
> > of the buffer to check.
> 
> > (Emacs-Lisp Lexical)
> >
> > when we have lexical binding in the current buffer?  Does anybody
> > have an opinion here?
> 
> IMO it's not worth spending space on the mode line for this.  Yeah,
> sometimes I want to check, and M-< followed by C-u C-SPC to go back
> works fine for that.

+10.  YAGNI.

Emacs itself should avoid adding more stuff to the
mode line.  It should be conservative about that.

In addition to `M-< C-u C-SPC', it's trivial and
quick to do `C-h v lex TAB'.