From my understanding of closures, yes, the above sample is
a closure. I reread the Camel (2nd ed. pg. 253) and the
example given there is similar, but the one above has added
an additional sub (doit) to the mix. It also states that
"By and large, closures are not something you need to trouble
yourself about."
The purpose however is to allow for something to run in the
in the context it was initially called outside of that
context. Which means you are creating an anonymous sub
that will retain its initial values and when you access
it at a later point it will "remember" it had a value.

In the above example $dave is equal to a sub, it
appears that Data::Dumper doesn't handle closures since
I ran $dave through the Dumper and it gave me a value of
sub { "DUMMY" }
hmmmm

Any way interesting chunck of code.

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