Documentation

Lean.HeadIndex

inductive Lean.HeadIndex :

Datastructure for representing the "head symbol" of an expression. It is the key of KExprMap. Examples:

  • The head of f a is .const f
  • The head of let x := 1; f x is .const f
  • The head of fun x => fun is .lam

HeadIndex is a very simple index, and is used in situations where we want to find definitionally equal terms, but we want to minimize the search by checking only pairs of terms that have the same HeadIndex.

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    Hash code for a HeadIndex value.

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      Return the number of arguments in the given expression with respect to its HeadIndex

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        Convert the given expression into a HeadIndex.

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