It is legal. It means "look for this method in the Barfoo class rather than the Foobar class". It's almost always the wrong thing to do. It's more likely you wanted to do this: 
Barfoo->thisone($fb);

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Note that this is class method and this the class name is the first parameter.

In reply to Re: Invoking method in another package by perrin
in thread Invoking method in another package by nutshell

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