Adds exception class, closes #2928
Adds exception class, closes #2928

MasterDuke17/doc,perl6/doc,perl6/doc,tbrowder/doc,MasterDuke17/doc,tbrowder/doc,tbrowder/doc,MasterDuke17/doc,perl6/doc,perl6/doc,MasterDuke17/doc,perl6/doc,tbrowder/doc