Rust updates

[David Piepgrass]

>> Oh, I can't tell you what a pet peeve PITA the C precedence 
>> is. Ugh! I know it's
>> against D philosophy to change the precedence w.r.t. C, but 
>> how about a
>> compromise: give a warning or error for "x&2 > 0", with error 
>> message: "add
>> parenthesis around x&2 to clarify your intention."
>
>   bool test(int x) { return x & 2 > 0; }
>
> gives:
>
>   foo.d(1): Error: 2 > 0 must be parenthesized when next to 
> operator &

Doh! You read my mind before I thought it :) I hadn't got around 
to bit fiddling in D yet.