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.

int find(char[] s, dchar c)
{
    // c is a universal character
    foreach (int i, dchar c2; s)
    {
    if (c == c2)
        return i;
    }
    return -1;
}

void main()
{
    char[] hello = "hello world";
    int i = find(hello, 'w');
    assert(i == 6);
    i = find(hello, 'z');
    assert(i == -1);
}