Added testcase showing leakage.

tests/c-api-tests/bool-leak.c

@@ -0,0 +1,35 @@
+#include "c_interface.h"
+
+#include <stdio.h>
+
+int main()
+{
+    VC vc;
+    vc = vc_createValidityChecker();
+
+    Expr x = vc_varExpr(vc, "x", vc_boolType(vc));
+    Expr y = vc_varExpr(vc, "y", vc_boolType(vc));
+
+    Expr x_and_y = vc_andExpr(vc, x, y);
+    Expr not_x_and_y = vc_notExpr(vc, x_and_y);
+
+    Expr not_x = vc_notExpr(vc, x);
+    Expr not_y = vc_notExpr(vc, y);
+    Expr not_x_or_not_y = vc_orExpr(vc, not_x, not_y);
+
+    Expr equiv = vc_iffExpr(vc, not_x_and_y, not_x_or_not_y);
+
+    printf("%d\n", vc_query(vc, equiv));
+
+    vc_DeleteExpr(equiv);
+    vc_DeleteExpr(not_x_or_not_y);
+    vc_DeleteExpr(not_y);
+    vc_DeleteExpr(not_x);
+    vc_DeleteExpr(not_x_and_y);
+    vc_DeleteExpr(x_and_y);
+    vc_DeleteExpr(y);
+    vc_DeleteExpr(x);
+    vc_Destroy(vc);
+
+    return 0;
+}