The new std.process is ready for review

[Lars T. Kyllingstad]

On Wednesday, 6 March 2013 at 07:27:19 UTC, Lars T. Kyllingstad 
wrote:
> On Tuesday, 5 March 2013 at 21:04:15 UTC, Vladimir Panteleev 
> wrote:
>> 5. How about that Environment.opIn_r?
>
> Forgot about it. :)  I'll add it.

So I sat down to write this function, but then I reconsidered.  
The thing is, checking whether the variable exists is exactly the 
same operation as retrieving it.  In other words, this:

    if (key in environment)
    {
        auto val = environment[key];
        ...
    }

is equivalent to:

    if (environment.get(key) !is null)
    {
        auto val = environment.get(key);
        ...
    }

That just seems... wrong, somehow.  Instead, I think we should 
encourage code like this:

    auto val = environment.get(key);
    if (val !is null)
    {
        ...
    }

or, even better, IMO:

    if (auto val = environment.get(key))
    {
        ...
    }

But feel free to convince me otherwise, you've had great success 
with that so far. :)

Lars