> "I would not expect anything 
> reasonable for y after applying a destructive operation to x." 

That's right, but do you consider 'queue x' ('construct(x)$Queue INT')
destructive?

> an implementation of Stack that copies its constructor argument 
> and another implementation that does not.

See my other thread "2 issues about aggcat.spad",
I think both construct and parts in FriCAS *are required* to copy
its argument, otherwise will be a bug.

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