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From: "nickhuang99 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/104113] New: DR 625 forbids "auto" being used in template argument and parser fails to issue correct error message for it Date: Wed, 19 Jan 2022 10:46:26 +0000 [thread overview] Message-ID: <bug-104113-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104113 Bug ID: 104113 Summary: DR 625 forbids "auto" being used in template argument and parser fails to issue correct error message for it Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: nickhuang99 at hotmail dot com Target Milestone: --- DR 625 forbids "auto" to be used in template argument. And developer has specific error message for this and fails to issue it for the very case: (https://www.godbolt.org/z/198fn1jr1) template <class T> struct A {}; template <class T> void f(A<T> x) {} void g() { f(A<short>()); A<auto> x = A<short>(); } The error message is very misleading. Note that only the 2nd error message is parser confirmed error message which is considered as conversion issue instead of "auto" being forbidden to be in template argument. (The 1st error message is parser tentative parsing issued.) <source>: In function 'void g()': <source>:14:11: error: template argument 1 is invalid 14 | A<auto> x = A<short>(); | ^ <source>:14:17: error: cannot convert 'A<short int>' to 'int' in initialization 14 | A<auto> x = A<short>(); | ^~~~~~~~~~ | | | A<short int> And this case can be reduced as template<typename T> struct A{}; A<auto> x = A<short>(); This is related to PR104091, however, it is very different because this one is not affected by "-std=c++XX"
next reply other threads:[~2022-01-19 10:46 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-01-19 10:46 nickhuang99 at hotmail dot com [this message] 2022-01-19 11:01 ` [Bug c++/104113] " pinskia at gcc dot gnu.org 2022-01-19 11:05 ` [Bug c++/104113] invalid template argument causes the type to become int which confuses the rest of the diagnostic pinskia at gcc dot gnu.org 2022-01-19 11:18 ` pinskia at gcc dot gnu.org 2022-01-19 11:21 ` pinskia at gcc dot gnu.org 2022-01-21 14:48 ` nickhuang99 at hotmail dot com 2022-01-21 15:02 ` nickhuang99 at hotmail dot com 2022-01-21 15:44 ` mpolacek at gcc dot gnu.org 2023-08-01 1:26 ` pinskia at gcc dot gnu.org 2023-08-01 1:29 ` pinskia at gcc dot gnu.org 2024-03-06 2:13 ` pinskia at gcc dot gnu.org
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