Why not all statement are expressions ?

[Nick Sabalausky]

"Jacob Carlborg" <doob at me.com> wrote in message 
news:jo98d1$frl$1 at digitalmars.com...
> On 2012-05-07 19:06, deadalnix wrote:
>> Hi,
>>
>> Working on D I noticed that some statement, notably assert, are
>> expression of type void. Why not all statement (that are not expression
>> already) are expression ?
>
> I would like that as well.
>

I'm usually fairly ambivalent about the idea of statements being 
expressions, but I would *love* for switch to be usable as an expression. 
For instance, in Haxe, you can do stuff like the following, which I get a 
ton of use out of and often wish D had:

a = switch(b)
{
    case 1: "foo";
    case 2: "bar";
    case 3: "baz";
    case 4: "whee";
    default: "blork";
}

The D equivalents aren't terrible, but they aren't nearly as nice.