const by default.

[Regan Heath]

On Fri, 07 Jul 2006 10:42:41 -0700, Walter Bright  
<newshound at digitalmars.com> wrote:
> void bar(C c) { c.m = 3; } // ok
> void foo(in C c) { c.m = 3; } // error

I don't like that you're differentiating between implicit and explicit use  
of 'in'.

I assume you're doing this to preserve backward compatibility with  
existing D code and/or to avoid having to create/add a mutable keyword?

Regan