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From: "haoxintu at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/95725] New: Confusing error diagnostic in an invalid template Date: Wed, 17 Jun 2020 17:02:40 +0000 [thread overview] Message-ID: <bug-95725-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95725 Bug ID: 95725 Summary: Confusing error diagnostic in an invalid template Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: haoxintu at gmail dot com Target Milestone: --- This code test.cc, makes GCC get confused while parsing. $cat test.cc template <decltype(= ; $g++-trunk -w -c test.cc test.cc:1:20: error: expected primary-expression before ‘=’ token 1 | template <decltype(= ; | ^ test.cc:1:22: error: expected primary-expression before ‘;’ token 1 | template <decltype(= ; | ^ test.cc:1:22: error: expected ‘>’ before ‘;’ token test.cc:1:22: error: expected unqualified-id before ‘;’ token $g++-10 -w -c test.cc test.cc:1:20: error: expected primary-expression before ‘=’ token 1 | template <decltype(= ; | ^ test.cc:1:22: error: expected primary-expression before ‘;’ token 1 | template <decltype(= ; | ^ test.cc:1:21: error: expected ‘)’ before ‘;’ token 1 | template <decltype(= ; | ~ ^~ | ) test.cc:1:22: error: expected ‘>’ before ‘;’ token 1 | template <decltype(= ; | ^ test.cc:1:22: error: expected unqualified-id before ‘;’ token $g++-9 -w -c test.cc test.cc:1:20: error: expected primary-expression before ‘=’ token 1 | template <decltype(= ; | ^ test.cc:1:22: error: expected primary-expression before ‘;’ token 1 | template <decltype(= ; | ^ test.cc:1:21: error: expected ‘)’ before ‘;’ token 1 | template <decltype(= ; | ~ ^~ | ) test.cc:1:20: error: expected primary-expression before ‘=’ token 1 | template <decltype(= ; | ^ test.cc:1:22: error: expected primary-expression before ‘;’ token 1 | template <decltype(= ; | ^ test.cc:1:11: error: expected identifier before ‘decltype’ 1 | template <decltype(= ; | ^~~~~~~~ test.cc:1:20: error: expected primary-expression before ‘=’ token 1 | template <decltype(= ; | ^ test.cc:1:22: error: expected primary-expression before ‘;’ token 1 | template <decltype(= ; | ^ test.cc:1:21: error: expected ‘)’ before ‘;’ token 1 | template <decltype(= ; | ~ ^~ | ) test.cc:1:20: error: expected primary-expression before ‘=’ token 1 | template <decltype(= ; | ^ test.cc:1:22: error: expected primary-expression before ‘;’ token 1 | template <decltype(= ; | ^ test.cc:1:20: error: expected primary-expression before ‘=’ token 1 | template <decltype(= ; | ^ test.cc:1:22: error: expected primary-expression before ‘;’ token 1 | template <decltype(= ; | ^ test.cc:1:11: error: expected ‘>’ before ‘decltype’ 1 | template <decltype(= ; | ^~~~~~~~ test.cc:1:22: error: expected unqualified-id before ‘;’ token 1 | template <decltype(= ; | ^ My GCC versions are: $g++-trunk --version g++ (GCC) 11.0.0 20200526 (experimental) Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $g++-10 --version g++-10 (Ubuntu 10.1.0-2ubuntu1~18.04) 10.1.0 Copyright (C) 2020 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. $g++-9 --version g++-9 (Ubuntu 9.3.0-11ubuntu0~18.04.1) 9.3.0 Copyright (C) 2019 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. In conclusion, GCC might have two issues in parsing this code: 1. GCC-trunk misses "error: expected ‘)’ before ‘;’ token" message 2. GCC-9 emits too many duplicated error messages.
next reply other threads:[~2020-06-17 17:02 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-06-17 17:02 haoxintu at gmail dot com [this message] 2020-06-17 17:43 ` [Bug c++/95725] " marxin at gcc dot gnu.org 2020-06-17 17:49 ` haoxintu at gmail dot com 2020-06-17 18:58 ` msebor at gcc dot gnu.org 2020-06-17 23:49 ` mpolacek at gcc dot gnu.org 2020-06-17 23:57 ` redi at gcc dot gnu.org 2020-06-18 1:51 ` haoxintu at gmail dot com 2020-06-18 6:23 ` haoxintu at gmail dot com 2020-06-18 8:34 ` rguenth at gcc dot gnu.org 2020-06-18 11:26 ` redi at gcc dot gnu.org 2020-06-18 11:31 ` redi at gcc dot gnu.org 2024-05-09 9:08 ` redi at gcc dot gnu.org
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