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 aa3;

extern(C) int printf(char*, ...);
alias char[] string;

void main()
{
    int[string] aa;
    {aa["hello"] = 1;}
    {int* p = "" in aa;}
    aa[" worl"] = 2;
    aa["d"] = 3;
    aa["thisisgreat"] = 10;
    int sum;
    string cat;
    {
    foreach(k,v;aa)
    {
        printf("int[%.*s] = %d\n", k.length, k.ptr, v);
        sum += v;
        cat ~= k;
    }
    }
    assert(sum == 16);
    printf("cat = %.*s\n", cat.length, cat.ptr);
    assert(cat.length == 22);
}