bug#30846: 26.0.91; debug-watch of kill-all-local-variables triggers 'assertion failed: found == !EQ (blv->defcell, blv->valcell)'

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@gmail.com>
> Cc: 30846@debbugs.gnu.org
> Date: Sun, 18 Mar 2018 10:20:54 -0400
> 
> I don't really understand what the assertion is testing, at a high
> level (that is, why does it expect 'defcell' and 'valcell' to have
> that relation).

Yes, the 'found' member could use a better documentation.  (Btw, all
calls to set_blv_found seem to use the last argument of zero.)

I hope Stefan can comment on this.