On 9/17/2014 7:51 PM, Bill McCloskey wrote:
If this change proves to be really disruptive to add-on authors, I wonder if we could just make
"let" behave like "var" for add-ons? The JS tokenizer could just substitute var
for let when parsing code from an add-on compartment. (Bug 1030420 will put add-on code in a
separate compartment and it's ready to land soon.) I think that would mostly mitigate the concerns
Jeff raised in the previous thread about having to test two configurations.
-Bill
Substituting var for let does not result in code that behaves
identically to previous code, so I can't see why that would be proposed.
These two snippets give different results:
let s = "valid";
{ let s = "invalid";}
dump(s);
gives a different result than
var s = "valid";
{ var s = "invalid";}
dump(s);
If you wanted a reasonable compromise, only flagging the duplicated
definition of "let" in strict mode would be a viable solution.
:rkent
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