20.3 Additional exception mechanisms

We do not cover the entire Dylan exception protocol in this book. Here, we mention briefly certain other techniques that we do not discuss further in this book:

• You can signal conditions with cerror, and break, in addition to with the error and signal functions. The cerror function establishes a simple restart, then signals an error in a manner similar to error. The break function directly invokes the debugger without signaling.

• The exception clause of block and let handler takes several options that, among other things, can facilitate restart signaling and handling.

• There are additional protocols for attaching a user interface to returning or restarting (return-query, restart-query), which could be used with handlers that act like interactive debuggers.

See The Dylan Reference Manual, for more information.