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bug#25929: 25.2; map-delete doesn't delete permanently 1st alist elt


From: Nicolas Petton
Subject: bug#25929: 25.2; map-delete doesn't delete permanently 1st alist elt
Date: Wed, 26 Apr 2017 09:58:10 +0200

Stefan Monnier <address@hidden> writes:

> That's right.  Or it could signal an error, if copying is considered to
> be "never the right thing to do".

If hash-tables were persistent data structures, I'd say that it would
definitely be the right thing to do.

I didn't implement map.el as a functional library because vectors and
hash-tables are not persistent.

Nico

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