Successful call to 'ns registers it in *loaded-libs* This enables REP…

…L successful use cases such as =>(ns a) nil =>(ns b (:require a)) nil

Signed-off-by: Rich Hickey <richhickey@gmail.com>

src/clj/clojure/core.clj

@@ -5223,7 +5223,10 @@
         ~@(when gen-class-call (list gen-class-call))
         ~@(when (and (not= name 'clojure.core) (not-any? #(= :refer-clojure (first %)) references))
             `((clojure.core/refer '~'clojure.core)))
-        ~@(map process-reference references)))))
+        ~@(map process-reference references))
+        (if (.equals '~name 'clojure.core) 
+          nil
+          (do (dosync (commute @#'*loaded-libs* conj '~name)) nil)))))
 
 (defmacro refer-clojure
   "Same as (refer 'clojure.core <filters>)"

test/clojure/test_clojure/repl.clj

@@ -35,3 +35,17 @@
     (is (some #{'defmacro} (apropos 'defmacro)))
     (is (some #{'defmacro} (apropos 'efmac)))
     (is (= [] (apropos 'nothing-has-this-name)))))
+
+
+(defmacro call-ns 
+  "Call ns with a unique namespace name. Return the result of calling ns"
+  []  `(ns a#))
+(defmacro call-ns-sym 
+  "Call ns wih a unique namespace name. Return the namespace symbol."
+  [] `(do (ns a#) 'a#))
+
+(deftest test-dynamic-ns
+  (testing "a call to ns returns nil"
+   (is (= nil (call-ns))))
+  (testing "requiring a dynamically created ns should not throw an exception"
+    (is (= nil (let [a (call-ns-sym)] (require a))))))