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• Typecode

Typecode-fix

Fixing function for typecodes.

Signature

(typecode-fix x) → code

Returns

code — Type (typecodep code).

Definitions and Theorems

Function: typecode-fix

(defun typecode-fix (x)
  (declare (xargs :guard t))
  (let ((__function__ 'typecode-fix))
    (declare (ignorable __function__))
    (if (typecodep x) x 0)))

Theorem: typecodep-of-typecode-fix

(defthm typecodep-of-typecode-fix
  (b* ((code (typecode-fix x)))
    (typecodep code))
  :rule-classes :rewrite)

Theorem: typecode-fix-when-typecodep

(defthm typecode-fix-when-typecodep
  (implies (typecodep x)
           (equal (typecode-fix x) x)))