Block Lambdas: break and continue

[Brendan Eich]

With completion values as In ES1-5, not even depending on 
http://wiki.ecmascript.org/doku.php?id=harmony:completion_reform, it 
might be enough to say:


    foo  {||
        exit: {
             ...
             if (...) {
                 "early";
                 break exit;
             }
             ...
         }
    }


IINM this would work. Sugaring it using 'with' looks nice -- always 
tempting to re-use 'with'.

I have some angst about loss of a hunk of code running "break L" up 
against " with (E)\nS" where E is an expression and S is a statement and 
the two came from a bone-fide with statement later in the unmangled source.

/be
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