tweak advanced
[lambda.git] / miscellaneous_lambda_challenges_and_advanced_topics.mdwn
index 511135a..ea7799c 100644 (file)
@@ -476,17 +476,13 @@ can use.
                        let make_list = \h t. \f z continue_handler abort_handler.
                                f h z (\z. t f z continue_handler abort_handler) abort_handler
 
-               now `extract_head` can return the leftmost head directly, using its `abort_handler`:
+               now `extract_head` should return the leftmost head directly, using its `abort_handler`:
 
                        let extract_head = \lst larger_computation. lst
-                                       ; here's our f
                                        (\hd sofar continue_handler abort_handler. abort_handler hd)
-                                       ; here's our z
                                        junk
-                                       ; here's the continue_handler for the leftmost application of f
                                        larger_computation
-                                       ; here's the abort_handler
-                                       larger_computation  in
+                                       larger_computation
 
        3.      To extract tails efficiently, too, it'd be nice to fuse the apparatus developed
                in these v5 lists with the ideas from the v4 lists, above.