[Issue 13861] compiler segfault with nested struct, cannot access frame

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13861

--- Comment #8 from John Colvin <john.loughran.colvin at gmail.com> ---
Further reduced:

struct Foo(alias f)
{
    struct Bar
    {
        Bar func()
        {
            return Bar();
        }
    }
}

void main()
{
    Foo!(n => n) a;
}

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