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bug#31314: 26.1; using % escapes in prompt for interactive

From: Lars Ingebrigtsen
Subject: bug#31314: 26.1; using % escapes in prompt for interactive
Date: Sat, 13 Jul 2019 17:19:40 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

"Roland Winkler" <address@hidden> writes:

> Running the following command interactively in emacs -Q
>    (defun foo-num (n1 n2)
>      "Display numbers N1 and N2."
>      (interactive "nNumber 1: \nnNumber 1: %e, Number 2: ")
>      (message "Number 1: %9.2e, Number 2: %e" n1 n2))
> yields the error message
>   Format specifier doesn?FFE2?FF80?FF99t match argument type
> The problem is the `%e' apearing in the prompt for `interactive'.
> If this is replaced by a generic `%s' everything works fine.
> The docstring of `interactive' says that the % escapes can be used
> as in calls of `format', which sugests to me that these escapes
> should match the data types of the arguments that have already been
> read.  Yet it seems that in this context the previously read
> arguments are interpreted as strings.  So either the docstring of
> `interactive' should say that one may use %s escapes for all types
> of arguments or something else should be fixed to make this work
> with any type of arguments.

I changed the doc string to say "%s", since that's apparently the only
thing allowed currently.  Extending `interactive' to allow
other types may be nice, though.

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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