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Null-literal

Null-literalp

Recognize the Java null literal.

Signature
(null-literalp x) → yes/no
Returns: yes/no — Type (booleanp yes/no).

The Java null literal is a list of Java Unicode characters that consists of the (ASCII) codes of *null-literal*.

Definitions and Theorems

Function: null-literalp

(defun null-literalp (x)
  (declare (xargs :guard t))
  (let ((__function__ 'null-literalp))
    (declare (ignorable __function__))
    (and (ascii-listp x)
         (equal (ascii=>string x)
                *null-literal*))))

Theorem: booleanp-of-null-literalp

(defthm booleanp-of-null-literalp
  (b* ((yes/no (null-literalp x)))
    (booleanp yes/no))
  :rule-classes :rewrite)