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[130.44.146.16]) by smtp.gmail.com with ESMTPSA id ha10-20020a05622a2b0a00b0042796ee2fb4sm1809833qtb.30.2023.12.22.09.26.07 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 22 Dec 2023 09:26:07 -0800 (PST) Message-ID: <4e1adee6-269a-4a27-ad23-2742277d7889@redhat.com> Date: Fri, 22 Dec 2023 12:26:06 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 1/1] c++: Initial support for P0847R7 (Deducing This) [PR102609] To: waffl3x Cc: "gcc-patches@gcc.gnu.org" References: <575c0bbe-a3d6-4a54-b299-edff64df84b1@redhat.com> <59LofhYhxl7MLEuElXwZcESRB6MpjdG-iq-89B63siDRo5k0j-y6z-PVa6Y3iE1xE5LkJwpwTFi82bd0RZjB1yZbSJptFdPTBWfvOGj1W78=@protonmail.com> From: Jason Merrill In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-6.2 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,KAM_SHORT,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 12/22/23 04:01, waffl3x wrote: > > int n = 0; > auto f = [](this Self){ > static_assert(__is_same (decltype(n), int)); > decltype((n)) a; // { dg-error {is not captured} } > }; > f(); > > Could you clarify if this error being removed was intentional. I do > recall that Patrick Palka wanted to remove this error in his patch, but > it seemed to me like you stated it would be incorrect to allow it. > Since the error is no longer present I assume I am misunderstanding the > exchange. > > In any case, let me know if I need to modify my test case or if this > error needs to be added back in. Removing the error was correct under https://eel.is/c++draft/expr.prim#id.unqual-3 Naming n in that lambda would not refer a capture by copy, so the decltype is the same as outside the lambda. Jason