Hello!

I compile the following example:
--------------------------------
template <class T> class X {
    T t_;
};

class Y;

class Z {
    X<Y>* x_;
};
--------------------------------

and get an error from my compiler:

CC: "foo.C", line 2: error:  Y undefined, size not known (1437)
"foo.C", line 2:   error detected during the instantiation of X <Y>
"foo.C", line 8:   is the site of the instantiation

Could you confirm that my compiler is wrong, and should not require
that I #include the definition of type Y.

I could not find the answer in the draft (I looked in chapter
14.2...).

Thanks!
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