If you give keyword two arguments the first one is the namespace, and
you are generating a namespaced keyword.  To expand on your example:

clojure.core=> (in-ns 'm)
#<Namespace m>
m=> (clojure.core/keyword "m" "7")
:m/7
m=> {::7 "foo"}
{:m/7 "foo"}
m=>

If you want to chain strings together to make a keyword, then you'll
have to wrap them in str or the like:

clojure.core=> (keyword (str "m" "7"))
:m7
clojure.core=>

Cheers,
DD

(2013/04/15 0:37), ubun2 wrote:
> (keyword "m" "7") ;;=> :m/7
> 
> :m/7 ;;=> #<RuntimeException java.lang.RuntimeException: Invalid token:
> :m/7>
> 
> a bug right?
> 
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