Can `let`, `static` and `yield` still be used as Identifier?

Gary Guo nbdd0121 at
Mon Dec 29 02:35:48 PST 2014

From the specification I saw `yield` is being explicitly declared as an possible Identifier in non-strict mode, and there `let`, `static` are parsed as identifier first. However, I did not see anyway to distinguish `let` identifier and `let` keyword. `let=1` is parsed as illegal in traceur, and so does `static=1`. Is this a bug of traceur or it is intended? It would be incompatible in non-strict mode if this is intended. (And if this is intended, there will be no reason for keep `let` and `static` non-reserved-word during lex stage) 		 	   		  
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