Project Lambda: Java Language Specification draft

[Mark Thornton]

Peter Levart wrote:
>   
>>   #()( {1,2,3} )   // Proposed collection literal expression from Coin
>>     
>
> Well, without parentheses the above example shows why the proposed collection literal expression 
> syntax is inappropriate. That syntax is reserved for statements - expressions should not mess 
> with it. Without mandatory parentheses, this is ambiguous:
>
> #() {}
>
> ...is this an expression lambda returning empty collection or a statement lambda returning void?
>   
Unfortunately Java already has array initialisation using {}, so the 
syntax clearly isn't reserved just for statements. I think that existing 
use for array initialisation was one of the reasons for using {} in 
collection literals instead of [].

Mark Thornton