Fix refcnt error

amos402 · amos402 · commit fe5050dfccb4 · 2019-12-26T22:26:05.000+08:00
diff --git a/src/runtime/classbase.cs b/src/runtime/classbase.cs
@@ -260,6 +260,7 @@ public static IntPtr tp_repr(IntPtr ob)
 
                 //otherwise use the standard object.__repr__(inst)
                 IntPtr args = Runtime.PyTuple_New(1);
+                Runtime.XIncref(ob);
                 Runtime.PyTuple_SetItem(args, 0, ob);
                 IntPtr reprFunc = Runtime.PyObject_GetAttrString(Runtime.PyBaseObjectType, "__repr__");
                 var output =  Runtime.PyObject_Call(reprFunc, args, IntPtr.Zero);
