Another interesting fact is that:
Clojure 1.2.1
user=> {'(1) :list [1] :vector}
java.lang.IllegalArgumentException: Duplicate key: (1) (NO_SOURCE_FILE:0)
Clojure 1.3.0
user=> {'(1) :list [1] :vector}
{(1) :vector}
Clojure 1.4.0-beta1
user=> {'(1) :list [1] :vector}
{(1) :vector}
...but I don't know what's going on.
On Tuesday, April 3, 2012 9:11:50 AM UTC+2, JuanManuel Gimeno Illa wrote:
>
> Playing with some problems of 4clojure, I wanted to make a map which, for
> each empty collection, returns a keyword. But it seems that it is
> impossible to have both an empty list and an empty vector in the same map.
>
> user=> {() :list}
> {() :list}
> user=> {() :list [] :vector}
> IllegalArgumentException Duplicate key:
> clojure.lang.PersistentList$EmptyList@1
> clojure.lang.PersistentArrayMap.createWithCheck
> (PersistentArrayMap.java:70)
> user=> {[] :vector}
> {[] :vector}
>
> I supposed that this is due to (= [] ()) but
>
> user=> {'(1) :list [1] :vector}
> {(1) :vector}
> user=> (= [1]'(1))
> true
>
> What am I missing?
>
> Juan Manuel
>
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