Internal compiler error 2000 - is this the Millenium bug?!?

[Dave Maley <d dot maley at stmarys-belfast dot ac dot uk>]

I'm getting some intriguing behaviour from this toy program:

class Dummy1 {};
class Dummy2 {};

template <class T1> class X {
public:
  void m() {;}
};

class Z : public X<Dummy1> {
};

class W : public X<Dummy2>, public Z {
public:
  void f() {X<Dummy2>::m();}
};

int main()
{
  W z;
  z.f();
  //z.W::X<Dummy2>::m();
  z.Z::template X<Dummy2>::m();
}

I'm using gcc version egcs-2.92.27 19981206 (gcc2 ss-980609 experimental)
on a P200, Solaris 2.5.

As it stands, I get

test.cpp: In function `int main()':
test.cpp:21: Internal compiler error 2000.

If I change 'Z' to 'W' in line 21, I get

test.cpp:21: no class template named `X' in `class W'

However, neither of these are what I'm concerned with. The commented-out
line is my concern. Uncommented, I get

test.cpp:20: request for member `X' is ambiguous
test.cpp:20: parse error before `>'

I don't understand why I can disambiguate X<Dummy2>::m() within W (i.e. in
the definition of function f()) but not outside. Is it my problem?

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