There will soon be a spec for let that will fail in this circumstance, 
letting you know.

On Wednesday, July 6, 2016 at 7:42:22 AM UTC-5, Leon Grapenthin wrote:
>
> 1.9 could still support the behavior that worked in 1.8 and in CLJS, too, 
> or throw a compile time Exception. 
>
> If we had known this change in behavior, fixing it in the codebase 
> wouldn't have been much trouble. But a missing default can lead to errors 
> far away so it takes time to get to the ground of this.
>
> If there was no (working) other way to provide a default for namespaced 
> keys in 1.8 I believe that many people will have tried adding the ns and 
> ran with it.
>
>
> On Wednesday, July 6, 2016 at 2:17:14 PM UTC+2, Alex Miller wrote:
>>
>> This *is* different than 1.8 (and prior) because it has been buggy since 
>> namespaced keys were added (due to a lack of tests - entirely my fault). 
>> Nothing was ever documented about this behavior - it was purely accidental 
>> and I would consider it in the realm of "unspecified".
>>
>> In 1.9 I added additional tests and tightened up this code in the process 
>> of adding the namespaced key support. 
>>
>

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