Note that this version of Generic_Stack is composable. Since this version supports assignment (:=) and equality (=), we can create stacks of stacks. Even if you never create a stack of stacks, checking to see if a reusable component is composable is a good way to check on the generality of a resuable component [Wheeler 1992].
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David A. Wheeler (dwheeler@ida.org)
The master copy of this file is at "http://www.adahome.com/Tutorials/Lovelace/s12sfr2.htm".