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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++/104476] New: using-decl shadowed by member function when in
 incomplete-class context
Date: Wed, 09 Feb 2022 19:40:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104476

            Bug ID: 104476
           Summary: using-decl shadowed by member function when in
                    incomplete-class context
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ppalka at gcc dot gnu.org
  Target Milestone: ---

We reject the following valid testcase:

struct A {
  static void f();
};

struct B : A
{
  using A::f;         // #1
  static void f(int); // #2
  auto g() -> decltype(f());  // Call should be accepted via #1, instead
rejected
};

with

<stdin>:9:25: error: no matching function for call to =E2=80=98B::f()=E2=80=
=99
<stdin>:8:15: note: candidate: =E2=80=98static void B::f(int)=E2=80=99
<stdin>:8:15: note:   candidate expects 1 argument, 0 provided
<stdin>:9:25: error: no matching function for call to =E2=80=98B::f()=E2=80=
=99
<stdin>:8:15: note: candidate: =E2=80=98static void B::f(int)=E2=80=99
<stdin>:8:15: note:   candidate expects 1 argument, 0 provided

Yet if we swap the order of the declarations #1 and #2, then we accept the
testcase.=