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From: "stevenxia990430 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110031] New: ICE: error reporting routines re-entered on
 non-type template argument
Date: Mon, 29 May 2023 22:45:53 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 12.1.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: stevenxia990430 at gmail dot com
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110031

            Bug ID: 110031
           Summary: ICE: error reporting routines re-entered on non-type
                    template argument
           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: error reporting
routines re-entered. Checked on clang and it was rejected as invalid code.
Tested on gcc trunk.=20


To quickly reproduce: https://gcc.godbolt.org/z/ex14EKeox
```
#include <type_traits>

#include <iostream>
template <typename T>
constexpr void print_type()
{
  std::cout << "Type: " << typeid(T).name();
}
template <typename T, std::enable_if_t<std::is_literal_type_v<std::decay_t<=
T>>,
int> =3D 0>
struct A {
  A(T &&)
  {
  }
};

template <typename T>
struct A<T> {
  A(T &&) =3D delete;
};

int main(void)
{
  A a{5.3};
  return 0;
}
```

Note, if we comment out the A a{5.3}; line in main function, gcc-trunk actu=
ally
accept this code (compiles) however it is rejected by clang. Might be relat=
ed
to  this: bug109390=