use Exception::Class (
    'MyException',
     ^^^^^^^^^^^                                                        #1
    'AnotherException' => { isa => 'MyException' },
    ^^^^^^^^^^^^^^^^^               ^^^^^^^^^^^                         #2 & 3
    'YetAnotherException' => {
    ^^^^^^^^^^^^^^^^^^^^                                                #4
        isa         => 'AnotherException',
                        ^^^^^^^^^^^^^^^^                                #5
        description => 'These exceptions are related to IPC'
    },

    'ExceptionWithFields' => {
     ^^^^^^^^^^^^^^^^^^^                                                #6
        isa    => 'YetAnotherException',                                #7
                   ^^^^^^^^^^^^^^^^^^^
        fields => [ 'grandiosity', 'quixotic' ],
        alias  => 'throw_fields',
    },
);