On Thu, 20 Apr 2000 14:05:27 +1200 (NZST) "Richard A. O'Keefe" <ok at atlas.otago.ac.nz> wrote:
>How does it know that given the example
>	'a'. 'b'
>('a' become: 'b') is not a sensible thing to try?
>

Richard,

A clue to this can be found by browsing denders of #become:. One method that shows up is methodFinder>>noteDangerous which says:

	"Remember the methods with really bad side effects."

Cheers,
Bob