The range of the application of [namespace.udecl#11]

The set of declarations named by a using-declarator that inhabits a class C does not include member functions and member function templates of a base class that correspond to (and thus would conflict with) a declaration of a function or function template in C.

See the following example

struct Base{
    static void fun(){}
};
struct D:Base{
    using Base::fun;
    // decltype(fun()) a;  //#1
    // static auto fun()->decltype(fun()){return 0;}  //#2
    static int fun(){
        return 0;
    }
    decltype(fun()) a;  //#3
};

#1 and #2 are both ill-formed considered by the major implementations. Instead, #3 is ok. It seems that the bullet [namespace.udecl#11] does not uniformly apply to any case. It appears to me that the declarations named by using-declaration are being hidden from the point P which is immediately after the locus of the declarations that is declared in C.

Should we say

After a point P, the set of declarations named by a using-declarator that inhabits a class C does not include member functions and member function templates of a base class that correspond to (and thus would conflict with) a declaration of a function or function template in C where P is immediately after the locus of the declaration.

Start with [namespace.udecl#11] and the Base/D example in the issue, comparing the behavior of #1, #2, and #3 described there. Determine whether the clause needs a point-P qualification, with wording complete when it uniformly explains the reported cases.