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.foreach9;
extern(C) int printf(char* str, ...);

struct array2d(T) {
  int test() {
    printf("%p\n", cast(void*) this);
    foreach (x; *this) {
      printf("%p\n", cast(void*) this);
    }
    return true;
  }
  int opApply(int delegate(ref int) dg) {
    int x;
    return dg(x), 0;
  }
}

unittest {
  array2d!(int) test;
  test.test();
  //int i = 0; i /= i;
}

void main() { }