Being a bear of little brain I'm probably missing something fundamental
here, but...

On Fri, 16 Aug 2002, Richard A. O'Keefe wrote:
> 
> The simplest change is
> 
> 	removeAll: aCollection
> 	    |c|
> 	    
> 	    (c := aCollection) == self ifTrue: [c := c copy].
> 	    c do: [:each | self remove: each].
> 	    ^c

...what's wrong with

	aCollection == self ifTrue: [^self species new].

?

Ian