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From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113814] New: [modules] ICE with imported partial
 specialization matching existing template-id
Date: Wed, 07 Feb 2024 19:15:05 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113814

            Bug ID: 113814
           Summary: [modules] ICE with imported partial specialization
                    matching existing template-id
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ppalka at gcc dot gnu.org
  Target Milestone: ---

Reduced from the hello-1 ICE tracked by PR113710:

$ cat header.h
template<int __i, typename _Tp>
struct tuple_element;

template<typename...>
struct tuple { };

template<int __i, typename... _Elements>
tuple_element<__i, tuple<_Elements...>>
get(tuple<_Elements...>);

$ cat testcase.H
#include "header.h"

template<int __i, typename... _Elements>
struct tuple_element<__i, tuple<_Elements...>> { };

$ cat testcase.C
#include "header.h"
import "testcase.H"

int main() {
  get<0>(tuple<int, int>{});
}

$ g++ -fmodules-ts testcase.H testcase.C
testcase.C: In function =E2=80=98int main()=E2=80=99:
testcase.C:5:3: internal compiler error: canonical types differ for identic=
al
types =E2=80=98tuple_element<__i, tuple<_Elements ...> >=E2=80=99 and =E2=
=80=98tuple_element<__i,
tuple<_Elements ...> >=E2=80=99
    5 |   get<0>(tuple<int, int>{});
      |   ^~~=