http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57314
Daniel Krügler <daniel.kruegler at googlemail dot com> changed:
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--- Comment #1 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
The standard does not clearly say that. Note that "default arguments" doesn't
naturally extend to default *template* arguments. There exists a core language
issue in regard to this kind of example,
http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1635
