foreach (x; a .. b) and foreach_reverse (x; a .. b) should be disallowed

[Robert Fraser]

Jason House wrote:
> Andrei Alexandrescu Wrote:
> 
>> Consider:
>>
>>      foreach (x; 1.0 .. 4.1) writeln(x);
>>      foreach_reverse (x; 1.0 .. 4.1) writeln(x);
>>
>> This sucks. foreach with interval for floating-point types should be 
>> disallowed.
>>
>>
>> Andrei
> 
> I agree that makes little sense.
> 
> I'm curious, why the sudden pruning of features? Can you please consider removing SFINAE? I'd also love to see is expressions go the way of the dinosaur. I don't know what their replacement should look like, but there _has_ to be a better and less error prone syntax!

I agree about SFINAE, but what's so bad about is()? If it does get 
removed, I hope whatever replaces it can do all the weird things is can 
(e.x. is(typeof({}())))