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bug#25561: 25.1; "Making isearch-search-fun-function local to *Minibuf-1

From: Eli Zaretskii
Subject: bug#25561: 25.1; "Making isearch-search-fun-function local to *Minibuf-1* while let-bound!" warning with Evil
Date: Fri, 10 Feb 2017 12:16:32 +0200

> From: Stefan Monnier <address@hidden>
> Date: Wed, 08 Feb 2017 17:21:11 -0500
> Cc: address@hidden, Juri Linkov <address@hidden>
> >> > a user of the Evil package reported [1] that using a search command
> >> > results in a "Making isearch-search-fun-function local to *Minibuf-1*
> >> > while let-bound!" warning.  This appears to be an interaction between
> >> > isearch and Evil, more specifically, Evil let-binds
> >> > `isearch-search-fun-function' to something of its own, invokes isearch
> >> > and something in isearch ends up running
> >> > `minibuffer-history-isearch-setup' which `make-local-variable' to have
> >> > `isearch-search-fun-function' have a separate value, resulting in the
> >> > aforementioned warning.
> >> >
> >> > What's the recommended way to avoid or silence it?  Stefan suggested
> >> > elsewhere [2] that this might indicate a bug, hence why I'm bringing
> >> > this up here.
> I plead guilty of adding this warning.  But FWIW, I think it was
> misguided: the interaction between make-local-variable and let-binding
> can be pretty tricky, which is why I added the warning (thinking that
> such things should better be avoided), but in my subsequent experience,
> I haven't found a single case where the problem is real.  Worse: it's
> often difficult/ugly to change the code to avoid the "tricky"
> interaction, because the code that does the let-binding doesn't know
> about the other and vice-versa.
> So, while the trickiness rmains, I think it's best to just hope for the
> best, silently, rather than signal a warning that nobody (not even me)
> knows how to address satisfactorily.

So you are saying we should remove that warning entirely?

What about the other warning, "Making FOO buffer-local while let-bound!"?

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