bug#30078: 27.0.50; Use lexical-binding for M-:

[Eli Zaretskii]

> From: Stefan Monnier <monnier@IRO.UMontreal.CA>
> Cc: michael_heerdegen@web.de, 30078@debbugs.gnu.org
> Date: Fri, 12 Jan 2018 13:49:00 -0500
> 
> > Please, not in *scratch*.  Setting variables and then evaluating forms
> > that use them is very useful there.
> 
> I'm not sure how the two sentences are connected:
> Setting lexical-binding to t in *scratch* won't prevent setting
> variables and evaluating forms that use them.

For some value of "prevent", surely?  Dynamically-bound variables will
no longer work as they did before, right?