[Bug c++/10437] "using namespace" at global scope creates incorrect code

[richard-gccbugzilla at metafoo dot co.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=10437

Richard Smith <richard-gccbugzilla at metafoo dot co.uk> changed:

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--- Comment #11 from Richard Smith <richard-gccbugzilla at metafoo dot co.uk> ---
(In reply to Nathan Sidwell from comment #9)
> Now the second point. This a case of SFINAE failure, no diagnostic should
> be issued.

I disagree. The failure is not in the immediate context of the substitution, so
this is a hard error. GCC seems to be doing the right thing in all cases here.