Throwing errors on mutating immutable bindings

Andreas Rossberg rossberg at
Thu Oct 2 00:31:24 PDT 2014

On 2 October 2014 09:24, Andreas Rossberg <rossberg at> wrote:
> On 1 October 2014 20:32, Jason Orendorff <jason.orendorff at> wrote:
>> I think there is a way that the error could occur at runtime even in
>> all-strict-mode code: when a new const is added at toplevel in a
>> second script.
>>     <script>
>>       "use strict";
>>       function f(value) { x = value; }
>>     </script>
> That's an early ReferenceError right there, AFAICT, regardless of what
> follows in a later script.

I take that back, I just realised it's not.  I somehow thought that
strict mode would also fix unbound assignments, but apparently that
was wishful thinking on my part. Not happy. :(


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