What's wrong with this code?

[Steven Schveighoffer]

On Sat, 08 Jan 2011 15:46:01 -0500, Michal Minich  
<michal.minich at gmail.com> wrote:

> On Sat, 08 Jan 2011 20:34:39 +0000, Sean Eskapp wrote:
>
>> 		if(left == null)
>
> 1) write if (left is null) instead if checking for null. Equality
> operator is rewritten to a.opEquals(b), which you don't want if you
> checking for null.

Actually, this is no longer true.  For comparing two classes or  
interfaces, a == b becomes .opEquals(a, b)  which is defined in object.di  
and properly handles null references.

However, if checking for null, a is null is going to be more correct and  
as efficient as possible (a == b should be inlined to the same thing, but  
only if you have inlining enabled).

-Steve