[Dbix-class] no warnings 'DBIx::Class::Relationship::ManyToMany'; breaks on overridden many_to_many

[Peter Rabbitson]

Guillermo Roditi wrote:
> This doesn't work with IntrospectableM2M. If you are using both of them
> you'll get the following error:
> 
> DBIx::Class::Schema::throw_exception(): Unknown warnings category
> 'DBIx::Class::Relationship::ManyToMany'
> 
> This is true for any component that overrides many_to_many Suggestions
> anyone
> 

I can not reproduce it. What is it exactly you do to get the exception?
Also what version of perl (important).