This is Perl module MouseX::StrictConstructor. NAME MouseX::StrictConstructor - Makes your constructors strict INSTALLATION MouseX::StrictConstructor installation is straightforward. If your CPAN shell is set up, you should just be able to do $ cpan MouseX::StrictConstructor Download it, unpack it, then build it as per the usual: $ perl Makefile.PL $ make && make test Then install it: $ make install DOCUMENTATION MouseX::StrictConstructor documentation is available as in POD. So you can do: $ perldoc MouseX::StrictConstructor to read the documentation online with your favorite pager. LICENSE AND COPYRIGHT Copyright (c) 2010, Fuji, Goro (gfx). All rights reserved. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.