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    • Abstract-syntax-operations

    Constraint-vars

    Set of variables in a constraint.

    Signature
    (constraint-vars constr) → vars
    Arguments
    constr — Guard (constraintp constr).
    Returns
    vars — Type (string-setp vars).

    Definitions and Theorems

    Function: constraint-vars

    (defun constraint-vars (constr)
      (declare (xargs :guard (constraintp constr)))
      (let ((__function__ 'constraint-vars))
        (declare (ignorable __function__))
        (constraint-case constr
                         :equal (union (expression-vars constr.left)
                                       (expression-vars constr.right))
                         :relation (expression-list-vars constr.args))))

    Theorem: string-setp-of-constraint-vars

    (defthm string-setp-of-constraint-vars
      (b* ((vars (constraint-vars constr)))
        (string-setp vars))
      :rule-classes :rewrite)