namespace bug

[David Baraff]

This program fails to compile, but is legal.  Note that if
the we declare class Derived within namespace Foo, this compiles.
So the problem is using the style
   class Foo::Derived
for declarations.


Reading specs from /usr/local/share/egcs/lib/gcc-lib/sparc-sun-solaris2.6/egcs-2.93.21/specs
gcc version egcs-2.93.21 19990502 (gcc2 ss-980929 experimental)
 /usr/local/share/egcs/lib/gcc-lib/sparc-sun-solaris2.6/egcs-2.93.21/cpp -lang-c++ -v -D__GNUC__=2 -D__GNUG__=2 -D__cplusplus -D__GNUC_MINOR__=93 -Dsparc -Dsun -Dunix -D__svr4__ -D__SVR4 -D__sparc__ -D__sun__ -D__unix__ -D__svr4__ -D__SVR4 -D__sparc -D__sun -D__unix -Asystem(unix) -Asystem(svr4) -D__EXCEPTIONS -D__GCC_NEW_VARARGS__ -Acpu(sparc) -Amachine(sparc) crap.cpp crap.ii
GNU CPP version egcs-2.93.21 19990502 (gcc2 ss-980929 experimental) (sparc)
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/share/egcs/lib/gcc-lib/sparc-sun-solaris2.6/egcs-2.93.21/../../../../include/g++-2
 /usr/local/include
 /usr/local/share/egcs/lib/gcc-lib/sparc-sun-solaris2.6/egcs-2.93.21/../../../../sparc-sun-solaris2.6/include
 /usr/local/share/egcs/lib/gcc-lib/sparc-sun-solaris2.6/egcs-2.93.21/include
 /usr/include
End of search list.
The following default directories have been omitted from the search path:
End of omitted list.
 /usr/local/share/egcs/lib/gcc-lib/sparc-sun-solaris2.6/egcs-2.93.21/cc1plus crap.ii -quiet -dumpbase crap.cc -version -o crap.s
GNU C++ version egcs-2.93.21 19990502 (gcc2 ss-980929 experimental) (sparc-sun-solaris2.6) compiled by GNU C version egcs-2.93.21 19990502 (gcc2 ss-980929 experimental).
crap.cpp:19: ANSI C++ forbids declaration `Derived' with no type


// ------------ crap.cpp: -------------

namespace Foo {
    class Base;
    template <class T> class Derived;
}

class Foo::Base {
public:
    const int		elementSize;

    Base();
    ~Base();
};

template <class T>
class Foo::Derived : public Foo::Base {
public:

    Derived()
    {
    }
};