The (&) prototype is useful if you're writing subs that expect to be passed coderefs/callbacks. And (_) can be useful too.

perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'

In reply to Re^2: effects of ampersand and non ampersand when referencing a sub name by tobyink
in thread effects of ampersand and non ampersand when referencing a sub name by ISAI student

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