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.

/* Eratosthenes Sieve prime number calculation. */

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

bool flags[8191];

int main()
{   int     i, prime, k, count, iter;

    printf("10 iterations\n");
    for (iter = 1;
    iter <= 10;
    iter++)
    {
    count = 0;
    flags[] = true;
    for (i = 0; i < flags.length; i++)
    {   if (flags[i])
        {
        prime = i + i + 3;
        k = i + prime;
        while (k < flags.length)
        {
            flags[k] = false;
            k += prime;
        }
        count += 1;
        }
    }
    }
    printf("%d primes\n", count);
    return 0;
}