if(arr) now a warning

[ketmar via Digitalmars-d]

On Mon, 04 May 2015 10:27:47 +0000, Ola Fosheim Grøstad wrote:

> On Friday, 10 April 2015 at 10:14:43 UTC, Martin Nowak wrote:
>> if (arr) -> if (!arr.empty)
>>
>> It's much clearer and also what you need to write when you work with
>> ranges.
> 
> Maybe rename it "opEmpty" then.
> 
> Try to keep language protocols and library conventions separate.

or at least move it to "object.d", so i don't have to import "std.range" 
to get this check working.
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