Struct managed member declared with typeof does not support multiple levels of wrapping

[mlbrooks]

A single level of wrapping is demonstrated successfully in the test raii/typeof-member.

Here is an analogous test that fails, where there are two levels of wrapping:

    struct A {
        int x;
    };

    void  ?{}( A & ) { printf("custom A ctor called\n"); }
    void ^?{}( A & ) { printf("custom A dtor called\n"); }

    A foo( void );

    struct mid {
        typeof( foo() ) a;
    };

    struct outer {
        mid x;
    };                 // here

Actual: unique best alternative includes deleted identifier in ... ?{}, at "here"

Expect: compile successfully