A Python version of the `ii` combinator.

joy/library.py

@@ -783,6 +783,22 @@ def b(stack, expression, dictionary):
     return stack, concat(p, concat(q, expression)), dictionary
 
 
+@inscribe
+@FunctionWrapper
+def ii(stack, expression, dictionary):
+    '''
+    ::
+
+           ... a [Q] ii
+        ------------------
+            ... Q a Q
+
+    '''
+    quote, (a, stack) = stack
+    expression = concat(quote, (a, concat(quote, expression)))
+    return stack, expression, dictionary
+
+
 @inscribe
 @FunctionWrapper
 def dupdip(stack, expression, dictionary):