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Re: Raw string literals in Emacs lisp.

From: Stephen J. Turnbull
Subject: Re: Raw string literals in Emacs lisp.
Date: Sun, 03 Aug 2014 22:12:16 +0900

David Kastrup writes:

 > At any rate, things can get more complex, like with
 > (format "%s%c\n""r#"?\") => "r#\"
 > "

I'm not really worried about more complex.  I am concerned about
whether there's an unambiguous answer to "what is the value -- or
error -- of eval-print-last-sexp at point?"

In the case of

    (format "%s%c\n""r#"?\")-!-

it's "r#\"\n".  But for

    (format "%s%c\n""r#"?\"-!-)

you could argue that it's ?\" (that's XEmacs's opinion) or "?\\".  I
guess for XEmacs (which already has this syntax in the wild) the rule
should be "longest match wins" (because otherwise there's no way to
evaluate r#"?\" in an interactive buffer), but for Emacs that looks
like a deal-killer, and it's already present with just r#"?\".


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