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As could be seen from the last example, once the module has been use'd, its functions can be invoked by typing the full path of the package followed by :: and followed by the function name.
Note that if you are in package Foo and you are trying to access functions from package Foo::Bar, then typing Bar::my_func() will not do. You have to type the full path of the module. (Foo::Bar::my_func() in our case)
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Written by Shlomi Fish