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From: Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups: gmane.emacs.devel
Subject: Re: RFC: String interpolation
Date: Sun, 11 Dec 2016 21:39:30 -0500
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>> Keyword paramaters are also an option:
>> (fmt "This is %{thing}.2f and %{zot}ss" :thing (funcall '+ 3.42423 4))
> Yeah, that's prettier.

FWIW, I don't see why that's preferable to

    (let ((thing (funcall '+ 3.45453 4)))
      (preformat "This is %[2f]{thing} and %{zot}ss"))


-- Stefan