1 files changed, 45 insertions, 0 deletions
diff --git a/test/regress/regress0/rewriterules/length_gen_n.smt2 b/test/regress/regress0/rewriterules/length_gen_n.smt2
new file mode 100644
index 000000000..5d1255eb0
--- /dev/null
+++ b/test/regress/regress0/rewriterules/length_gen_n.smt2
@@ -0,0 +1,45 @@
+;; Same than length.smt2 but the nil case is not a rewrite rule
+;; So here the rewrite rules have no guards length
+
+(set-logic AUFLIA)
+(set-info :status unsat)
+
+;; don't use a datatypes for currently focusing in uf
+(declare-sort list 0)
+
+(declare-fun cons (Int list) list)
+(declare-fun nil  ()         list)
+
+
+;;define length
+(declare-fun length (list) Int)
+
+(assert (= (length nil) 0))
+
+(assert (forall ((?e Int) (?l list)) (! (= (length (cons ?e ?l)) (+ 1 (length ?l))) :rewrite-rule)))
+
+(declare-fun gen_cons (Int list) list)
+
+(assert (forall ((?n Int) (?l list)) (! (=> (= ?n 0) (= (gen_cons ?n ?l) ?l)) :rewrite-rule)))
+
+(assert (forall ((?n Int) (?l list)) (! (=> (> ?n 0) (= (gen_cons ?n ?l)
+        (gen_cons (- ?n 1) (cons 1 ?l)))) :rewrite-rule)))
+
+
+;;(assert (not (forall ((?n Int)) (=> (>= ?n 0) (=> (= (length (gen_cons ?n nil)) ?n) (= (length (gen_cons (+ ?n 1) nil)) (+ ?n 1))) ))))
+
+;;(assert (not (forall ((?n Int) (?l list)) (=> (>= ?n 0) (=> (= (length ?l) ?n) (= (length (cons 1 ?l)) (+ ?n 1))) ))))
+
+;; (assert (not (forall ((?n Int)) (=> (>= ?n 0) (=> (= (length (gen_cons ?n nil)) ?n) (= (length (cons 1 (gen_cons ?n nil))) (+ ?n 1))) ))))
+
+;;(assert (not (forall ((?n Int)) (=> (>= ?n 0) (= (gen_cons (+ ?n 1) nil) (cons 1 (gen_cons ?n nil))) ))))
+
+(assert (not (forall ((?n Int)) (=> (>= ?n 0) (=>
+        (forall ((?l list)) (= (gen_cons ?n (cons 1 ?l)) (cons 1 (gen_cons ?n ?l))))
+        (forall ((?l list)) (= (gen_cons (+ ?n 1) (cons 1 ?l)) (cons 1 (gen_cons (+ ?n 1) ?l))))
+     )))))
+
+
+(check-sat)
+
+(exit)