if(arr) now a warning

[Daniel Murphy via Digitalmars-d]

"Andrei Alexandrescu"  wrote in message 
news:mhtggg$26b5$1 at digitalmars.com...

> I think we need to stop here. I'll make the PR today for reverting this 
> language change. We can't handle D like a semester science project, 
> because for as long as we do we won't have credibility.

> This trickle of teeny-bit breaking changes for the sake of touted benefits 
> must stop.

This breaking change prevents hard-to-find bugs.  The fact that you needed 
to make trivial changes to 39 places in std.allocator doesn't negate this.