This patch implements CWG DR21 [*]
Interestingly, we properly handled default template arguments on friend
class members but not on just friend classes:
struct A {
template <class T1> void foo();
};
class B {
template <class T1 = int> friend void A::foo();
};[*] http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#21 -- David Majnemer
dr21.diff
Description: Binary data
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