> Hm, that sounds like a nice test, in general, thank you. However, I'm
> not sure the class I am currently working on can be a part of an
> expression.
>
...
>
> Well, hopefully, the class I am talking about cannot really be made a
> part of an expression tree.
>From the documentation of your module:
>>> A = Object("A")
>>> B = Object("B")
>>> C = Object("C")
>>> f = NamedMorphism(A, B, "f")
>>> g = NamedMorphism(B, C, "g")
>>> d = Diagram([f, g])
f, g and d are already expression trees. Does f.subs(B, C) work?
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