Get the fn field from a g-apply.
(g-apply->fn x) → fn
This is an ordinary field accessor created by defprod.
Function:
(defun g-apply->fn$inline (x) (declare (xargs :guard (fgl-object-p x))) (declare (xargs :guard (equal (fgl-object-kind x) :g-apply))) (let ((__function__ 'g-apply->fn)) (declare (ignorable __function__)) (mbe :logic (b* ((x (and (equal (fgl-object-kind x) :g-apply) x))) (pseudo-fnsym-fix (cadr x))) :exec (cadr x))))
Theorem:
(defthm pseudo-fnsym-p-of-g-apply->fn (b* ((fn (g-apply->fn$inline x))) (pseudo-fnsym-p fn)) :rule-classes :rewrite)
Theorem:
(defthm g-apply->fn$inline-of-fgl-object-fix-x (equal (g-apply->fn$inline (fgl-object-fix x)) (g-apply->fn$inline x)))
Theorem:
(defthm g-apply->fn$inline-fgl-object-equiv-congruence-on-x (implies (fgl-object-equiv x x-equiv) (equal (g-apply->fn$inline x) (g-apply->fn$inline x-equiv))) :rule-classes :congruence)
Theorem:
(defthm g-apply->fn-when-wrong-kind (implies (not (equal (fgl-object-kind x) :g-apply)) (equal (g-apply->fn x) (pseudo-fnsym-fix nil))))