libexception-class-perl

module that allows you to declare real exception classes in Perl
Exception::Class allows you to declare exceptions in your modules in a
manner similar to how exceptions are declared in Java.
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It features a simple interface allowing programmers to 'declare'
exception classes at compile time. It also has a base exception
class, Exception::Class::Base, that can be used for classes stored in
files (aka modules ;) ) that are subclasses.
.
It is designed to make structured exception handling simpler and
better by encouraging people to use hierarchies of exceptions in their
applications.