bug#20707: [PROPOSED PATCH] Use curved quoting in C-generated errors

[Paul Eggert <eggert@cs.ucla.edu>]

Alan Mackenzie wrote:

> What I really meant with my question is how do you type curly characters
> when outwith Emacs?  Say, inside of less, or at a bash shell prompt, or
> in any of numerous other tools one might wish to use?

It doesn't come up that often, but for 'less' I am typically searching and 
searching for '.' will do -- I sometimes do that even for ASCII-only searches, 
as '.' is easier to type than, say, '\'.  I typically run Bash under Emacs where 
it's not a problem there either.

In the rarer cases where I'm outside Emacs or want to search just for curved 
quotes and nothing else, I can type Compose < ' and Compose > ' to get curved 
single quotes.  On my current keyboard, the Compose key looks like a menu and is 
just to the right of the right Alt key; this is the default setup that came with 
Ubuntu 15.04.  I'm sure one can get the Compose key to work on the Linux console 
too, as plenty of people need to type accented letters on the Linux console.

> it's yet another trivial annoyance that one has to heep onto all

Heh.  Trivial annoyances are what motivated this change.  I've been trivially 
annoyed at Emacs quoting `like this' for at least a decade.  Nearly every other 
GNU package has fixed it.  I was hoping Somebody Else would fix it for Emacs, 
but nobody ever stepped up so here we are.