|>> You cannot use open F,pop; because there are 3 args coming in, not 2.
The function in question is
On first glance, it looks like you can replace $_ with pop for a 2-character savings. However, look at where g() is called - &$3($2,$4,$'). There are three scalars in @_, not two. The fact that g() only uses two is irrelevant.
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