Add a test

Author: Smit-create

integration_tests/bindc_01.py

@@ -3,3 +3,11 @@
 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()