X-Git-Url: http://lambda.jimpryor.net/git/gitweb.cgi?p=lambda.git;a=blobdiff_plain;f=topics%2Fweek9_monad_transformers.mdwn;h=f9da05ad15f24c5c05b08a28e9da8051c96fd951;hp=b01904308de12bd76d439440ba58fffc7a618670;hb=fd2cb06c9e18732a6fbbf20da0b2f92dc981a5db;hpb=73dbb6a826f852b98672a36733be3d33b7cb00f6

diff --git a/topics/week9_monad_transformers.mdwn b/topics/week9_monad_transformers.mdwn
index b0190430..f9da05ad 100644
--- a/topics/week9_monad_transformers.mdwn
+++ b/topics/week9_monad_transformers.mdwn
@@ -155,23 +155,23 @@ Here's an example wrapping Option around List, and vice versa:
 
 	# module LO = Monad.List.T(Monad.Option);;
 	# module OL = Monad.Option.P(Monad.List);; (* we use the `.P` transformer to hoist List's ++ operation *)
-	# OL.(run (mzero ++ mid 20 >>= fun i -> mid (i+10)));;
+	# OL.(run (mzero ++ mid 20 >>= fun x -> mid (x+10) ));;
 	- : int OL.result = [Some 30]
 
 When List is on the inside, the failed results just got dropped and the computation proceeds without them.
 
-	# LO.(run (hoist Monad.Option.mzero ++ mid 20 >>= fun i -> mid (i+10)));;
+	# LO.(run (hoist Monad.Option.mzero ++ mid 20 >>= fun x -> mid (x+10) ));;
 	- : int LO.result = None
 
 On the other hand, when Option is on the inside, as in LO, failures (which we again represent by `mzero`s from the Option monad, not the List monad's own `mzero`; but here since it's the inner monad we need to `hoist Monad.Option.mzero`) abort the whole computation. (If you instead used the List monad's `mzero`, it'd be ignored by `++` and you'd end with just `Some [30]`.)
 
-This is fun. Notice the difference it makes whether the second `++` is native to the outer `Monad.List`, or whether it's the inner `Monad.List`'s `++` hoisted into the outer wrapper:
+This is fun. Here is a List around a List. Notice the difference it makes whether the second `++` is native to the outer `Monad.List`, or whether it's the inner `Monad.List`'s `++` hoisted into the outer wrapper:
 
 	# module LL = Monad.List.T(Monad.List);;
 
 	# LL.(run(mid 1 ++ mid 2 >>= fun x -> mid x ++ mid (10*x) ));;
 	- : int LL.result = \[[1; 10; 2; 20]]
-	#  LL.(run(mid 1 ++ mid 2 >>= fun x -> hoist Monad.List.(mid x ++ mid (10*x) )));;
+	#  LL.(run(mid 1 ++ mid 2 >>= fun x -> hoist Monad.List.(mid x ++ mid (10*x)) ));;
 	- : int LL.result = [[1; 2]; [1; 20]; [10; 2]; [10; 20]]
 
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