[Issue 20780] Function parameter UDA not accepted in nested function declarations

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20780

--- Comment #1 from Basile-z <b2.temp at gmx.com> ---
Better TC:

---
void main()
{
    struct  A;
    struct  B { struct CD;}
    alias   V = void;
    alias   I = int;
    V    test0(@A I)                {}
    V    test1(@A @(B) I)           {}
    V    test2(@(B.CD) @B I)        {}
    V    test3(@A I, @B @A I)       {}
    V    test3(@A I, @(B.CD) @A I)  {}
}
---

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