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 tangotests.mem6;

extern(C) int printf(char*,...);

int main(){
        int[] index;
        char[] value;

        foreach(int i, char c; "_\U00012345-"){
                printf("str[%d] = %d\n", i , cast(int)c);
                index ~= i;
                //value ~= c;
        }
        printf("done\n");

        return 0;
}