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Expression-if

Expression-if->test

Get the test field from a expression-if.

Signature
(expression-if->test x) → test
Arguments: x — Guard (expressionp x).
Returns: test — Type (expressionp test).

This is an ordinary field accessor created by fty::defprod.

Definitions and Theorems

Function: expression-if->test$inline

(defun expression-if->test$inline (x)
  (declare (xargs :guard (expressionp x)))
  (declare (xargs :guard (equal (expression-kind x) :if)))
  (let ((__function__ 'expression-if->test))
    (declare (ignorable __function__))
    (mbe :logic
         (b* ((x (and (equal (expression-kind x) :if)
                      x)))
           (expression-fix (std::da-nth 0 (cdr x))))
         :exec (std::da-nth 0 (cdr x)))))

Theorem: expressionp-of-expression-if->test

(defthm expressionp-of-expression-if->test
  (b* ((test (expression-if->test$inline x)))
    (expressionp test))
  :rule-classes :rewrite)

Theorem: expression-if->test$inline-of-expression-fix-x

(defthm expression-if->test$inline-of-expression-fix-x
  (equal (expression-if->test$inline (expression-fix x))
         (expression-if->test$inline x)))

Theorem: expression-if->test$inline-expression-equiv-congruence-on-x

(defthm expression-if->test$inline-expression-equiv-congruence-on-x
  (implies (expression-equiv x x-equiv)
           (equal (expression-if->test$inline x)
                  (expression-if->test$inline x-equiv)))
  :rule-classes :congruence)

Theorem: expression-if->test-when-wrong-kind

(defthm expression-if->test-when-wrong-kind
  (implies (not (equal (expression-kind x) :if))
           (equal (expression-if->test x)
                  (expression-fix nil))))