Another shot at fixing the issues with (constant) struct literals and their addresses. See DMD2682, #218, #324. The idea is to separate the notion of const from 'this variable can always be replaced with its initializer' in the frontend. To do that, I introduced Declaration::isSameAsInitializer, which is overridden in VarDeclaration to return false for constants that have a struct literal initializer. So {{{ const S s = S(5); void foo() { auto ps = &s; } // is no longer replaced by void foo() { auto ps = &(S(5)); } }}} To make taking the address of a struct constant with a struct-initializer outside of function scope possible, I made sure that AddrExp::optimize doesn't try to run the argument's optimization with WANTinterpret - that'd again replace the constant with a struct literal temporary.

module mini.nested16;

void main()
{
    int idx = 123;
    int func(int* idp)
    {
        void foo()
        {
            void bar(int* idp)
            {
                auto c = new class
                {
                    void mem()
                    {
                        scope(exit) ++*idp;
                    }
                };
                auto dg = () {
                    c.mem();
                };
                dg();
            }
            bar(idp);
            ++*idp;
        }
        foo();
        return ++*idp;
    }
    assert(func(&idx) == 126);
}