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From: "jlame646 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/106629] New: GCC accepts invalid program involving
 {1,2,3,4} as template argument
Date: Mon, 15 Aug 2022 16:05:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106629

            Bug ID: 106629
           Summary: GCC accepts invalid program involving {1,2,3,4} as
                    template argument
           Product: gcc
           Version: 12.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jlame646 at gmail dot com
  Target Milestone: ---

The following invalid program is accepted by gcc.
https://godbolt.org/z/Mb3qbvvPz=20

```
struct Impl
{
  constexpr Impl(std::initializer_list<int>)
  {

  }
};
struct Bar{};
template<typename T, Impl impl>
struct Foo
{

};
int main()
{
    constexpr Foo<Bar, {1,2,3,4}> foo; //works in msvc & gcc but rejected in
clang
    return 0;
}
```

The program is invalid because `{1,2,3,4}` cannot be a template argument.=