[racket] how can I change only one element in the vector?

From: Neil Van Dyke (neil at neilvandyke.org)
Date: Sat Nov 20 03:09:34 EST 2010

"make-vector" is creating a new vector populated with *references* to a 
single #("1" "2" "3") vector, *not* *copies* of the #("1" "2" "3") vector.

Since you've created one #("1" "2" "3") vector, changing it through one 
reference changes all references to it.

(Aside to PLT people: This might be an example of having the default 
writer show sharing could actually be helpful to beginners.)


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