[Catalyst] why use a local trick to replace the "$class->NEXT::setup"

[Matt S Trout]

luo.dongxiang wrote:
> When I was studying the source code of Catalyst, I found some 
> programming  trick:
>  
> Catalyst.pm   line  692
>  
>     # Call plugins setup
>     {
>         no warnings qw/redefine/;
>         local *setup = sub { };
>         $class->setup;
>     }

This is what allows plugins' setup methods to be called after the
setup_plugins stage without causing an infinite loop.

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