https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95597
Bug ID: 95597
Summary: Rejects using-declaration with "typename" in global
area
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 case test.cc
typedef int T;
using typename ::T;
GCC fails to compile it.
$g++ -c test.cc
test.cc:2:18: error: expected nested-name-specifier before 'T'
2 | using typename ::T;
| ^
I guess that GCC might have something wrong in dealing with global "::" with
"typename"(the code "int a; using ::a;" is compiled ok), and this case is not
the same as bug 14258 or bug 3303.
I also test this case in clang, icc, and msvc, they all accept test.cc.
