[Bug c++/84709] Cannot define method with same name of previously using declared class

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84709

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Proper testcase that actually shows the error:

namespace A {
  class Foo {
  };
}

using A::Foo;

namespace B {
  class Bar {
    const Foo &Foo() const;
  };
}

hide.cc:10:22: error: declaration of ‘const A::Foo& B::Bar::Foo() const’
[-fpermissive]
     const Foo &Foo() const;
                      ^~~~~
hide.cc:2:9: error: changes meaning of ‘Foo’ from ‘class A::Foo’ [-fpermissive]
   class Foo {
         ^~~


Which can be reduced to:

struct Foo { };

struct Bar {
  const Foo &Foo() const;
};


The member function B::Bar::foo does hide ::Foo, and that violates
[basic.scope.class]/2.