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From: "jyasskin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/50491] New: [C++0x] "unexpected ast of kind using_decl" on call to using'ed grandparent member function
Date: Thu, 22 Sep 2011 23:29:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D50491

             Bug #: 50491
           Summary: [C++0x] "unexpected ast of kind using_decl" on call to
                    using'ed grandparent member function
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jyasskin@gcc.gnu.org
                CC: aaw@google.com


$ cat test.ii
struct GrandParent {
  void *get();
};

template<class OBJ>
struct Parent : public GrandParent{
};

template<typename T>
struct Child : public Parent<T> {
  using GrandParent::get;
  void Foo() {
    void* ex =3D get();
  }
};

$ clang++ -std=3Dgnu++0x -fsyntax-only test.ii

$ g++-4.6 --version
g++-4.6 (GCC) 4.6.1

$ g++-4.6 -std=3Dgnu++0x -fsyntax-only test.ii
test.ii: In member function 'void Child<T>::Foo()':
test.ii:13:20: sorry, unimplemented: unexpected ast of kind using_decl
test.ii:13: confused by earlier errors, bailing out

$ g++-4.7svn --version
g++-4.7svn (GCC) 4.7.0 20110911 (experimental)

$ g++-4.7svn -std=3Dgnu++0x -fsyntax-only test.ii
test.ii: In member function =E2=80=98void Child<T>::Foo()=E2=80=99:
test.ii:13:20: sorry, unimplemented: unexpected ast of kind using_decl
test.ii:13:20: internal compiler error: in potential_constant_expression_1,=
 at
cp/semantics.c:8226


If I change the "get()" line to "(void)get();", g++-4.6.1 succeeds, but g++=
-4.7
still fails with the same error. Making GrandParent non-dependent by passin=
g a
concrete type to Parent<> makes both versions succeed.