Stewart MacLean <stingray at paradise.net.nz> wrote:
	It's late, can't see it?
	
	> 
	> 	The code that Bert gave:
	> 	
	> 	order := [:a :b | 
	> 	  a title < b title or: [
	> 	    a title = b title and: [a name < b name or: [
	> 	      a name = b name and: [a ref < b ref or: [
	> 	        a number < b number]]]]]]
	> 	
	> [There is an obvious error in this, which I leave as an exercise for
	>  the reader.]
	> 
	
title is tested twice,
name is tested twice,
ref SHOULD be tested twice, but is only tested once.
Ordering blocks should generally act like <=, so
the code should be

    order := [:a :b |                           "a <= b"
        a title < b title or:
	 [a title = b title and:
	   [a name < b name or:
	     [a name = b name and:
               [a ref < b ref or:
                 [a ref = b ref and:             "this was missing"
                   [a number <= b number]]]]]]]. "this was <"