1 files changed, 57 insertions, 0 deletions
diff --git a/Test/secure/simple.bpl b/Test/secure/simple.bpl
new file mode 100644
index 00000000..1d726014
--- /dev/null
+++ b/Test/secure/simple.bpl
@@ -0,0 +1,57 @@
+// Z3 4.1: /trace /z3opt:MBQI=true /proverOpt:OPTIMIZE_FOR_BV=true /z3opt:RELEVANCY=0
+function {:inline} xor(a: bool, b: bool) returns (bool)  { (!a && b) || (a && !b) }
+
+procedure Incorrect_A(
+    {:visible} a: bool, {:hidden} b: bool)
+returns ({:visible} ap: bool, {:hidden} bp: bool)
+  ensures xor(ap, bp) == xor(a, b);
+{
+   ap := a;
+   bp := b;
+}
+
+procedure Incorrect_B(
+    {:hidden} a: bool, {:visible} b: bool)
+returns ({:hidden} ap: bool, {:visible} bp: bool)
+  ensures xor(ap, bp) == xor(a, b);
+{
+   ap := a;
+   bp := b;
+}
+
+procedure Incorrect_X(
+    {:hidden} a: bool, {:hidden} b: bool)
+returns ({:hidden} ap: bool, {:hidden} bp: bool)
+  ensures xor(ap, bp) == xor(a, b);
+{
+   ap := a;
+   bp := b;
+}
+
+procedure Correct_A(
+    {:visible} a: bool, {:hidden} b: bool)
+returns ({:visible} ap: bool, {:hidden} bp: bool)
+  ensures xor(ap, bp) == xor(a, b);
+{
+   havoc ap;
+   bp := xor(xor(ap, a), b);
+}
+
+procedure Correct_B(
+    {:hidden} a: bool, {:visible} b: bool)
+returns ({:hidden} ap: bool, {:visible} bp: bool)
+  ensures xor(ap, bp) == xor(a, b);
+{
+   havoc ap;
+   bp := xor(xor(ap, a), b);
+}
+
+procedure Correct_X(
+    {:hidden} a: bool, {:hidden} b: bool)
+returns ({:hidden} ap: bool, {:hidden} bp: bool)
+  ensures xor(ap, bp) == xor(a, b);
+{
+   havoc ap;
+   bp := xor(xor(ap, a), b);
+}
+