CLJS-1568: LazyTransformer doesn't implement IMeta

Author: anmonteiro

src/main/cljs/cljs/core.cljs

@@ -3780,6 +3780,9 @@ reduces them without incurring seq initialization"
   (-with-meta [this new-meta]
     (LazyTransformer. stepper first rest new-meta))
 
+  IMeta
+  (-meta [this] meta)
+
   ICollection
   (-conj [this o]
     (cons o (-seq this)))

src/test/cljs/cljs/core_test.cljs

@@ -1507,7 +1507,9 @@
       (is (= (sequence xform data) '(36 200 10))))
     (let [xf (map #(+ %1 %2))]
       (is (= (sequence xf [0 0] [1 2]) [1 2])))
-    ))
+    (is (= (-> (sequence (map inc) [1 2 3])
+             (with-meta {:a 1})
+             meta) {:a 1}))))
 
 (deftest test-obj-equiv
   (testing "Object equiv method"