Just a couple of things. According to the docs for use:

[use] is exactly equivalent to 
       BEGIN { require Module; import Module LIST; }

[download]
except that Module must be a bareword.
In other words, at least according to the docs, if one wants to replicate at runtime what use does, it should be Foo->import, not Foo::import.

The second point is only a clarification of a potentially misleading detail. The routine Bar::old in your example can be called even if Bar::new has not been called first. In other words, it is not the case that executing Bar::new somehow defines Bar::old. (I'm not saying that you wrote or believe this, but someone reading your post may incorrectly draw this conclusion.)

the lowliest monk

In reply to Re^3: use depending on environment by tlm
in thread use depending on environment by Andre_br

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