Add non regress case for bug22

tests/sat/bug22.smt2

+;; produced by colibri.drv ;;
+(set-logic ALL)
+(set-info :smt-lib-version 2.6)
+;;; generated by SMT-LIB2 driver
+;;; SMT-LIB2 driver: bit-vectors, common part
+;;; SMT-LIB2: integer arithmetic
+
+(declare-sort integer 0)
+(declare-sort t 0)
+(declare-sort u 0)
+(declare-sort v 0)
+
+(declare-fun to_u (integer) u)
+(declare-fun to_v (t u) v)
+(declare-fun user_eq (v v) Bool)
+
+(declare-const dummy v)
+
+
+(declare-const x t)
+(declare-const y t)
+(declare-const z t)
+
+(declare-const a integer)
+(declare-const b integer)
+(declare-const c integer)
+
+
+
+
+(assert
+;; defqtvc
+ ;; File "member_alt.adb", line 1, characters 0-0
+  (not
+    (=
+      (not
+        (let ((tmp (to_v x (to_u a))))
+          (or (user_eq tmp (to_v y (to_u b)))
+              (user_eq tmp (to_v z (to_u c))))))
+      true)))
+(check-sat)