Re: [Emacs-diffs] master 9ce1d38: Use curved quotes in core elisp diagnostics

[Dmitry Gutov]

On 08/23/2015 01:43 AM, Paul Eggert wrote:

> For example:
>
>    (format "Moving file ‘%s’ to ‘%s’" src dest)
>    (message "Moving file ‘%s’ to ‘%s’" src dest)
>    (error "Cannot move file ‘%s’ to ‘%s’" src dest)
>
> All three uses generate ambiguous output if SRC and DEST can contain
> arbitrary characters, and this is true even if we fiddle with the format
> strings’ quoting styles.

The difference is that ambiguity in the latter two uses can't really 
cause a program to lose correctness (unless someone is catching and 
parsing the error's message). An ambiguity in `format' can cause an 
unexpected error due to a program, say, being unable to open a file.