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• Env

In-scope-env

Check whether a variable is in scope.

Signature

(in-scope-env ident env) → *

Arguments

ident — Guard (identp ident).

env — Guard (envp env).

A variable in scope does not necessarily have a value. A variable which is declared (see declare-var-env) but not initialized, or whose value is unknown.

Definitions and Theorems

Function: in-scope-env

(defun in-scope-env (ident env)
 (declare (xargs :guard (and (identp ident) (envp env))))
 (declare
     (xargs :type-prescription (booleanp (in-scope-env ident env))))
 (let ((__function__ 'in-scope-env))
   (declare (ignorable __function__))
   (and (consp env)
        (or (and (omap::assoc ident (first env)) t)
            (in-scope-env ident (rest env))))))