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bug#19208: replace-match unhelpful error message

From: Paul Eggert
Subject: bug#19208: replace-match unhelpful error message
Date: Sat, 3 Aug 2019 13:50:55 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

Lars Ingebrigtsen wrote:
they are
demonstrably confusing for people not used to seeing conditionals
written that way, which is I think pretty much everybody, except four
people working on Emacs.  :-)

Just four?  :-)  (Actually the style is also used in other GNU projects.)

In this particular case the Leibniz style caught a potentially-serious bug. Although I understand that it can be a minor irritation for newcomers, it is quite useful for range checking and in practice I find that its reliability outweighs any irritation. (I didn't like Val Schorre's advice either, when I first heard it - but he was right.)

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