[Bug c++/71882] elaborated-type-specifier friend not looked up in unnamed namespace

[sbergman at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71882

--- Comment #3 from Stephan Bergmann <sbergman at redhat dot com> ---
(In reply to Jonathan Wakely from comment #2)
> 10.3.1.2 [namespace.memdef] p3 says "the lookup to determine whether the
> entity has been previously declared shall not consider any scopes outside
> the innermost enclosing namespace." The struct S is not declared in the
> innermost enclosing namespace, but it is visible there, so normal name
> lookup would find it. But then this isn't normal name lookup, because it
> doesn't keep looking in enclosing namespaces, only the innermost.

I guess when I originally filed this bug I interpreted the quoted part of
[namespace.memdef] to mean that the lookup is done as per 6.4.1
[basic.lookup.unqual] but ignores scopes *outside* the innermost enclosing
namespace, but not scopes *inside* it, like a nested unnamed namespace.