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bug#5808: 23.1; substitute-in-file-name $NOSUCH vs ${NOSUCH}

From: Stefan Monnier
Subject: bug#5808: 23.1; substitute-in-file-name $NOSUCH vs ${NOSUCH}
Date: Tue, 30 Mar 2010 21:29:53 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.50 (gnu/linux)

> Evaluating
>     (substitute-in-file-name "$NOSUCHVAR")
>     => "$NOSUCHVAR
> but
>     (substitute-in-file-name "${NOSUCHVAR}")
>     => error
>     Substituting nonexistent environment variable "NOSUCHVAR"
> I'm not sure if this is a bug or a feature.  I see they were both errors
> in Emacs 21, but that 22 up forgives the first.

I made the change in Emacs-22 so that most uses of $ in file names can
work without needing the quoting by double-dollars.

It was a fairly easy change which should cover most cases.  Admittedly,
the resulting inconsistency is not great, so I guess that the
discrepancy is a misfeature/bug, but it's not very high up the list of
things to fix.  Patches welcome,


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