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From: "stevenxia990430 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110065] New: auto in template argument causes ICE, also
 accepts-invalid
Date: Wed, 31 May 2023 18:19:01 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.1.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110065

            Bug ID: 110065
           Summary: auto in template argument causes ICE, also
                    accepts-invalid
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: stevenxia990430 at gmail dot com
  Target Milestone: ---

The following program produces internal compiler error: Segmentation fault.
Tested on GCC-trunk

To quickly reproduce: https://gcc.godbolt.org/z/noY1qxK91
```
#include <type_traits>
#include <iostream>
auto main() -> int
{
    std::cout << std::is_scoped_enum_v<auto(&)(const int*) -> auto&>;
    return EXIT_SUCCESS;
}
```

Note, if we remove the std::cout and produce the following code:
```
#include <type_traits>
#include <iostream>
auto main() -> int
{
    std::is_scoped_enum_v<auto(&)(const int*) -> auto&>;
    return EXIT_SUCCESS;
}
```
gcc compiles without any error, however this code is rejected by Clang (tes=
ted
on Clang-trunk)=