> A `with-handlers' handler and a `call-with-exception-handler' handler > are invoked with different continuations. A `with-handlers' handler is > invoked with the continuation of the entire `with-handlers' > expression; a `call-with-exception-handler' handler is invoked with > the continuation of the `raise' call. In this example, the barrier is > gone by the time the `with-handlers' handler runs.
Ah! I now have a shorter example: (call-with-exception-handler (lambda (_) (control f 10)) (lambda () (raise 4))) Is it possible to observe this behavior without 'call-with-exception-handler' (and without other internal definitions such as 'exception-handler-key')? I am guessing it could be via other control operators. > I only discovered this subtlety myself about a week ago, Indeed 'call-with-exception-handler' does not appear a very common construct in the sense that I do not find it in OCaml or Java. But it looks handy. Thanks, Keiko _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
