1 files changed, 32 insertions, 0 deletions
diff --git a/test/regress/regress0/rewriterules/length_trick.smt2 b/test/regress/regress0/rewriterules/length_trick.smt2
new file mode 100644
index 000000000..84afc5815
--- /dev/null
+++ b/test/regress/regress0/rewriterules/length_trick.smt2
@@ -0,0 +1,32 @@
+;; 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)) (+ (length ?l) 1)) :rewrite-rule)))
+
+;;(assert (forall ((?l list)) (=> (= ?l nil) (= (length ?l) 0))))
+
+;;(assert (forall ((?e Int) (?l list) (?l2 list)) (=> (= ?l2 (cons ?e ?l)) (= (length ?l2) (+ (length ?l) 1)))))
+
+
+(assert (not (= (length (cons 1 (cons  2 (cons 3 nil)))) 3)))
+
+(check-sat)
+(exit)