fixes #4703

tests/js/tcopying.nim

@@ -1,5 +1,7 @@
 discard """
   output: '''123
+2 9
+2 9
 '''
 """
 
@@ -11,3 +13,25 @@ proc changeArray(a: var MyArray) =
 var a : MyArray
 changeArray(a)
 echo a[0]
+
+# bug #4703
+# Test 1
+block:
+    let ary1 = [1, 2, 3]
+    var ary2 = ary1
+
+    ary2[1] = 9
+
+    echo ary1[1], " ", ary2[1]
+
+# Test 2
+block:
+    type TestObj = ref object of RootObj
+        ary2: array[3, int]
+
+    let ary1 = [1, 2, 3]
+    var obj = TestObj(ary2:ary1)
+
+    obj.ary2[1] = 9
+
+    echo ary1[1], " ", obj.ary2[1]