20 Exceptions

xiden/exn defines exceptions for control in subprograms that are not message-oriented. It also provides procedures for constructing and raising exceptions. These procedures are not documented because they are private, and simple enough to be self-evident for maintainers.

For some instance E of these exception types, it may be the case that (equal? (exn-message E) ""). This is because some exceptions are meant for end-user display, and they should first be converted to messages for use with (get-message-formatter).