Re: Change of Lisp syntax for "fancy" quotes in Emacs 27?

[Paul Eggert]

Eli Zaretskii wrote:

> these examples are not relevant to the issue at hand,
> which is only about quotes

Quotes are part of the same problem. For example, here's some code in Gnus:

   (ignore-errors (gnus-get-function method 'open-server))

Change that APOSTROPHE (U+0027) to RIGHT SINGLE QUOTATION MARK (U+2019) and the 
code will look the same but do something quite different, with no diagnostic. 
This sort of code is reasonably common and can easily be security-relevant. If 
Emacs stops diagnosing this abuse of confusable characters, we're opening 
ourselves up more to malicious code.

> How will it lower the confusion, when the same is required for a space?

Let me rephrase my point, with apostrophe rather than space.

The point is not to distinguish ´open-server (with U+00B4 ACUTE ACCENT) from 
՚open-server (with U+055A ARMENIAN APOSTROPHE); the point is to distinguish both 
of these from the 'open-server (apostrophe followed by symbol) that a reader 
would ordinarily expect here. We need to give an obvious way for human readers 
to see that something odd is going on. Readers can then use C-x = (or whatever) 
to find out exactly what the oddness is.