[Bug c++/126825] New: Array decays to pointer when constructing element of std::initializer_list

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126825

            Bug ID: 126825
           Summary: Array decays to pointer when constructing element of
                    std::initializer_list
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/oKWWEToaf
Clang accepts this.
```
struct A {
        template<typename T>
        A(T& arg) {
                static_assert(std::is_same_v<T, const char[1]>);
        }
};

int main() {
        std::initializer_list<A> { "" };
}
```

```
<source>: In instantiation of 'A::A(T&) [with T = const char* const]':
<source>:12:32:   required from here
   12 |         std::initializer_list<A> { "" };
      |                                       ^
<source>:7:36: error: static assertion failed
    7 |                 static_assert(std::is_same_v<T, const char[1]>);
      |                               ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
  • 'const char* const' is not the same as 'const char [1]'
```