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.norun_debug8;

struct Str
{
    size_t len;
    void* ptr;
}

struct Foo
{
    long l;
    Bar bar;
}

struct Bar
{
    float x,y,z;
    Foo* foo;
}

void main()
{
    Str str;
    Foo foo;
    foo.l = 42;
    foo.bar.y = 3.1415;
    foo.bar.foo = &foo;

    int* fail = cast(int*) 1;
    *fail = 0;
}