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 package Foo::BarMod;
 use Foo::Bar;
...
 }
 # Everything else, including new(), from Foo::Bar
 1;

  Undefined subroutine Foo::BarMod::whiz at line 17.

  # call class method whiz()
  Foo::BarMod::whiz();

  Foo::BarMod->whiz();
  whiz Foo::BarMod;

  Foo:BarMod::whiz;