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Forbid reverse ranges in rx

From: Mattias Engdegård
Subject: Forbid reverse ranges in rx
Date: Tue, 12 Mar 2019 15:02:13 +0100
User-agent: Evolution 3.30.5 (3.30.5-1.fc29)

Given the trouble that reversed character ranges like a-Z cause in
standard regexps, there is no reason they should be allowed in rx.

Right now, (rx (any "0-9z-a")) becomes "[0-9]" and (rx (any (?9 . ?0)))
becomes "[9-0]". Such expressions are always a mistake; we do users a
disservice by allowing them.

The attached patch adds error checks, tests, documentation and a NEWS

Attachment: 0001-Disallow-reversed-char-ranges-in-rx.patch
Description: Text Data

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