Add a test

Author: Smit-create

integration_tests/bindc_01.py

@@ -1,5 +1,16 @@
 from lpython import c_p_pointer, CPtr, i16, Pointer, empty_c_void_p
 
-queries: CPtr = empty_c_void_p()
-x: Pointer[i16] = c_p_pointer(queries, i16)
-print(queries, x)
+
+def f():
+    queries: CPtr = empty_c_void_p()
+    x: Pointer[i16] = c_p_pointer(queries, i16)
+    print(queries, x)
+
+
+def test_issue_1781():
+    p: CPtr = empty_c_void_p()
+    assert p == empty_c_void_p()
+
+
+test_issue_1781()
+f()