Issue 2691: hexadecimal-escape-sequence is too greedy

Title: hexadecimal-escape-sequence is too greedy
Status: c++23
Section: 5.13.3 [lex.ccon]
Submitter: Fraser Gordon

Created on 2023-01-26.00:00:00 last changed 9 months ago

Messages

Date: 2023-01-27.23:50:39

Proposed resolution (approved by CWG 2023-01-27):

Change in 5.13.3 [lex.ccon] as follows:

hexadecimal-escape-sequence :
     \x hexadecimal-digit simple-hexadecimal-digit-sequence
     hexadecimal-escape-sequence hexadecimal-digit
     \x{ simple-hexadecimal-digit-sequence }

msg7150 (view)

Date: 2023-02-15.00:00:00

[Accepted at the February, 2023 meeting.]

The lexer grammar production hexadecimal-escape-sequence matches text of the form \x{20}ab due to its recursive definition.

History
Date	User	Action	Args
2023-07-16 13:00:43	admin	set	status: open -> c++23
2023-07-16 13:00:43	admin	set	status: accepted -> open
2023-02-18 18:43:04	admin	set	status: ready -> accepted
2023-02-07 05:32:28	admin	set	status: tentatively ready -> ready
2023-01-27 23:50:39	admin	set	status: open -> tentatively ready
2023-01-26 19:12:52	admin	set	messages: + msg7151
2023-01-26 00:00:00	admin	create