list literal gotcha and suggestion

[Mark Thornton]

Neal Gafter wrote:
> I think it was intended that the expressions in these literals not be constrained to be constants.
>
>   
I did read the original proposal first and that does restrict them to 
compile time constants. Possible extension to non constant elements is 
also mentioned and clearly could not be done with my suggestion. Or 
perhaps we could just say that if any elements are not constants then 
the result is always a List.

[1, 2, 3] implements List and Set
[1, 2, 1] implements List
[x] implements List
[] is an empty List and Set

Mark Thornton