The following code fails to compile:
  struct Foo {
    int x;
  };
  const Foo var = { 3 };
  static assert(var.x == 3);

That is, you cannot make assertions about the values of members of const structs.  Does anybody know whether this is a bug in the compiler, or just a missing feature in the language?  It seems like this would be easy enough to implement, and if it worked my compile-time string tokenizer would be a lot easier to write!