[Bug c++/104179] New: Truncated representation of character arrays as non-type template parameters

["stinkingmadgod at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104179

            Bug ID: 104179
           Summary: Truncated representation of character arrays as
                    non-type template parameters
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stinkingmadgod at gmail dot com
  Target Milestone: ---

#include<algorithm>

template<unsigned N>
struct str
{
    char data[N];
    consteval str(const char (&arr)[N])
    {
        std::copy(arr, arr + N, data);
    }
};

template<str>
struct print;

constexpr char s[] = {'4', '2'};
print<s> p;

Produces the error message

<source>:17:10: error: aggregate 'print<str<2>{"4"}> p' has incomplete type and
cannot be defined
   17 | print<s> p;

Where print<str<2>{"4"}> should be print<str<2>{"42"}>
The intention is likely to print null-terminated strings correctly, as in

print<"42"> p2;

<source>:16:13: error: aggregate 'print<str<3>{"42"}> p2' has incomplete type
and cannot be defined
   16 | print<"42"> p2;