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bug#31586: 27.0.50; `frame-title-format' doesn't save match data

From: Eli Zaretskii
Subject: bug#31586: 27.0.50; `frame-title-format' doesn't save match data
Date: Fri, 25 May 2018 09:31:02 +0300

> From: Philipp <address@hidden>
> Date: Thu, 24 May 2018 23:55:57 +0200
> emacs -Q -eval "(setq frame-title-format '(\"\" (:eval (string-match \".\" 
> \"a\"))))"
> Then go to the first character in the scratch buffer (M-<), and run
> M-% a RET b RET
> The first time you attempt to replace something, Emacs will signal an
> error:
> perform-replace: Args out of range: #<buffer *scratch*>, 0, 1

And this is an Emacs bug because...?  The :eval expression is yours,
so it's IMO your responsibility to protect it as needed.

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