Boolean shortcuts

[François REMY]

I agree that code block is a complex feature that is (almost) never used and 
that has many quirks.

If ES6 could remove it, I would not be upset at all. If it's here to stay, 
we should at least have an introductory keyword like "eval { ... }" and 
allow "var x = eval { ... }".

BTW, I think the reason of your inconsistency is a bug : eval("{}") should 
return undefined, as in IE9. It seems that node.js has a special case for 
{}, probably to avoid a common mistake. Or there's a bug in the parser, I 
don't know.