#### §5.4.(c) Exceptions

A guard predicate should not throw any exceptions. Yet, any exception thrown within a guard predicate cause the guard to evaluate to `false` rather than propagating the exception, meaning that the evaluation of a guard predicate will never interrupt the current base behaviour.
A compiler should flag any checked exception that is thrown within a guard. Such diagnosis should by default be treated as an error, with the option of configuring its severity to warning or ignore.