package inferno

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type variable

A unifier maintains a graph whose vertices are equivalence classes of variables. With each equivalence class, a piece of information of type data is attached.

type data = variable S.structure

By definition, data is a synonym for variable structure. So, the data attached with an equivalence class of variables is a structure whose children are variables.

val get : variable -> data

get v is the structure currently attached with the (equivalence class of the) variable v. The structure that is attached with a class can change when the unifier is invoked.

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