Mathieu wrote:
>> Probably because whoever wrote this was blessfully unaware that this
>> message is never sent but inlined by the compiler.
> 
> I think this is more beacause the right behavior is this. 
> As Ken Causey said (old) compiler do it wrong.

No, the compiler got it exactly right. It was faithfully optimizing the 
chosen definition of #ifNotNil: - whoever changed the definition "got it 
wrong" since the definition should not be changed without also changing 
the optimization in the compiler.

But what's *really* annoying to me is that this change went unnoticed.

Cheers,
   - Andreas