+ (test-f equal? str output)))
+
+(define-syntax test-exception
+ (syntax-rules ()
+ ((_ f)
+ (begin
+ (display (quote f))
+ (newline)
+ (call/cc (lambda (k)
+ (with-exception-handler
+ (lambda (x)
+ (when (eqv? 'no-exception x)
+ (error #f "test failed: no exception thrown"))
+ (k))
+ (lambda ()
+ (begin
+ f
+ (raise 'no-exception))))))))))