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• Error-checking

Ensure-lambda-arity

Cause an error if a lambda expression does not have a given arity.

Signature

(ensure-lambda-arity lambd n description 
                     error-erp error-val ctx state) 
 
  → 
(mv erp val state)

Arguments

lambd — Lambda expression to check.
    Guard (pseudo-lambdap lambd).

n — Arity that lambd must have.
    Guard (natp n).

description — Guard (msgp description).

error-erp — Flag to return in case of error.

error-val — Value to return in case of error.

ctx — Context for errors.

Returns

erp — Type (implies erp (equal erp error-erp)).

val — Type (and (implies erp (equal val error-val)) (implies (and (not erp) error-erp) (not val))) .

Definitions and Theorems

Function: ensure-lambda-arity

(defun ensure-lambda-arity (lambd n description
                                  error-erp error-val ctx state)
  (declare (xargs :stobjs (state)))
  (declare (xargs :guard (and (pseudo-lambdap lambd)
                              (natp n)
                              (msgp description))))
  (b* (((unless (= (arity lambd (w state)) n))
        (er-soft+ ctx error-erp error-val
                  "~@0 must take ~x1 ~@2." description
                  n (if (= n 1) "argument" "arguments"))))
    (value nil)))

Theorem: return-type-of-ensure-lambda-arity.erp

(defthm return-type-of-ensure-lambda-arity.erp
  (b* (((mv ?erp ?val ?state)
        (ensure-lambda-arity lambd n description
                             error-erp error-val ctx state)))
    (implies erp (equal erp error-erp)))
  :rule-classes :rewrite)

Theorem: return-type-of-ensure-lambda-arity.val

(defthm return-type-of-ensure-lambda-arity.val
  (b* (((mv ?erp ?val ?state)
        (ensure-lambda-arity lambd n description
                             error-erp error-val ctx state)))
    (and (implies erp (equal val error-val))
         (implies (and (not erp) error-erp)
                  (not val))))
  :rule-classes :rewrite)

Subtopics

Ensure-lambda-arity$

Calls ensure-lambda-arity with ctx and state as the last two arguments.