This is a maintenance nightmare waiting to happen. Use a proper method call,
Squeak Smalltalk blocks are just similar enough to Scheme lambdas that I still
fall into this trap, too.
(letrec ((carre (lambda (s1 s2 s3 s4 n)
(if (> n 0)
(carre (segment s1 s2)
(segment s2 s3)
(segment s3 s4)
(segment s1 s4)
(- n 1))))))
'oops-must-remember-this-is-Squeak-not-Scheme)
Ben
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