Why D const is annoying

[Jesse Phillips]

On Sun, 11 Dec 2011 19:40:42 +0100
Mafi <mafi at example.org> wrote:

> void f(ref const(int)* a, const(int)* b) {a = b; }
> void main() {
>    immutable(int)* a;
>    auto b = (new int[](5)).ptr;
>    f(a, b);
>    //if this compiles I have just assigned a mutable pointer
>    //to an immutable one
> }
> 
> With the above definition using inout, such a call would be
> disallowed.

Just gave this code a try:

void f(ref const(int)* a, const(int)* b) {a = b; }
void main() {
   const(int)* a;
   immutable(int)* b;
   auto c = (new int[](5)).ptr;
   f(a, c);
   f(b, c); //test.d(7): Error: cast(const(int)*)b is not an lvalue
}