X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=assignment_3_evaluator.mdwn;h=c910064a790698d67cc27a0dd807b3acca70f3a3;hp=496003d08e11017e54aa4324e7f04a521ce2a60b;hb=2950fbdc81547d95aa8fda13cc3e042ca264e0e6;hpb=d6c90390eadec4c8ec2c7728269ca063e9e45de0;ds=sidebyside

diff --git a/assignment_3_evaluator.mdwn b/assignment_3_evaluator.mdwn
index 496003d0..c910064a 100644
--- a/assignment_3_evaluator.mdwn
+++ b/assignment_3_evaluator.mdwn
@@ -21,7 +21,7 @@ let mylist = make\_list 1 (make\_list 2 (make\_list 3 empty)) in
 let iszero = \n. n (\x. false) true in
 let succ = \n s z. s (n s z) in
 let mul = \m n s. m (n s) in
-let pred = \n. iszero n 0 (length (tail (n (\p. make\_list junk p) empty))) in
+let pred = (\shift n. n shift (make\_pair 0 0) get\_snd) (\p. p (\x y. make\_pair (succ x) x))  in
 let leq = \m n. iszero(n pred m) in
 let eq = \m n. and (leq m n)(leq n m) in
 ;