opSlice() magic for foreach now works?

[Steven Schveighoffer]

On Wed, 30 Mar 2011 11:29:02 -0400, spir <denis.spir at gmail.com> wrote:

>
> Strange, I just tried it on a custom, trivial, collection type  
> --precisely to verify that it does not work only for the standard  
> SList-- and it worked fine (dmd 2.051 on ubuntu). But now I cannot  
> reproduce this success anymore! get the same error as you. Will go on  
> trying and tell you if anything changes.
>
> Anyway, if the feature is still unimplemented, why and how does foreach  
> work on SList. ???

It may be partially/poorly implemented.  I looked at the disassembly, and  
it is indeed calling opSlice and the range primitives inside the foreach  
loop.

There is likely a trigger that the compiler uses to determine if it can do  
that, and the trigger is probably incorrectly defined.

I would think (though I'm not a compiler guy) that to fix this should be  
minor since the code generation already works in at least one case.   
Walter?

-Steve