3.4.2[basic.lookup.argdep] paragraph 2 bullet 2 of n3000 contain this
wording:

"- a block-scope function declaration that is not a using-declaration"

A function declaration however is defined in terms of a decl-specifier-seq
and declarators (7[dcl.dcl] paragraph 6 and 7), and it seems that at least
once it's taken for granted that a using declaration is never a function
declaration. Consider 7.3.3[namespace.udecl] paragraph 14 for an example
(two using declarations don't conflict, because none of them is a block- or
namespace-scope function declaration).

There are other subsections than 3.4.2 that seem to include using
declarations as being a function declaration, for instance 13[over]
paragraph 1.

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