It is ok if the interpreter throws an error, but it should not crash.

Running the following code (taken from http://mitpress.mit.edu/sicp/full-text/book/book-Z-H-10.html#%_thm_1.6), which results in an infinite recursion, makes the SCM interpreter seggault. Other Scheme interpreters, such as Guile and MIT-Scheme, will only abort with a "stack overflow" or "maximum recursion depth exceeded" error.

Using SCM 5e5 on Ubuntu 9.04 (i386).

(define (improve guess x)
  (average guess (/ x guess)))

(define (average x y)
  (/ (+ x y) 2))

(define (good-enough? guess x)
  (< (abs (- (square guess) x)) 0.001))

(define (sqrt x)
  (sqrt-iter 1.0 x))

(define (new-if predicate then-clause else-clause)
  (cond (predicate then-clause)
        (else else-clause)))

(define (sqrt-iter guess x)
  (new-if (good-enough? guess x)
          guess
          (sqrt-iter (improve guess x)
                     x)))

(define (square x) (* x x))

(sqrt 3)