Subject: delete-non-matching-lines optional arg REND not really optional

From: Boruch Baum <[email-masked]>
Date: Thu, 15 Oct 2020 14:57:49 -0400

Unlike other functions with optional BEG and END args, where END is
presumed to be (point-max) if not supplied, function
delete-non-matching-lines returns an error when only RBEG is supplied.

Error: (wrong-type-argument number-or-marker-p nil)

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