Re: format-quote?

[Richard Stallman]

    For example, if you use (error (error-message-string foo)), it's possible
    that `error-message-string' will return something like this: "No match for
    regexp `^[^#$%>\n]*[#$%>] *\\S-.*'". Calling `error' on this directly would
    result in the (derivative) error "Not enough arguments for format string".

You should write (error "%s" (error-message-string foo)).

Are there places in Emacs now that get this wrong?