Add some tests related to instance variables

testsuite/tests/typing-misc/typecore_errors.ml

@@ -91,17 +91,6 @@ Error: This expression has type 'a * 'b
 |}]
 
 
-(** Masked instance variable *)
-let c = object val x= 0 val y = x end
-[%%expect{|
-Line 1, characters 32-33:
-1 | let c = object val x= 0 val y = x end
-                                    ^
-Error: The instance variable x
-       cannot be accessed from the definition of another instance variable
-|}]
-
-
 (** No value clause *)
 
 let f x = match x with exception Not_found -> ();;

testsuite/tests/typing-objects/Tests.ml

@@ -916,3 +916,34 @@ Line 2, characters 8-52:
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 Error: This kind of recursive class expression is not allowed
 |}];;
+
+class a = object val x = 3 val y = x + 2 end;;
+[%%expect{|
+Line 1, characters 35-36:
+1 | class a = object val x = 3 val y = x + 2 end;;
+                                       ^
+Error: The instance variable x
+       cannot be accessed from the definition of another instance variable
+|}];;
+
+class a = object (self) val x = self#m method m = 3 end;;
+[%%expect{|
+Line 1, characters 32-36:
+1 | class a = object (self) val x = self#m method m = 3 end;;
+                                    ^^^^
+Error: The instance variable self
+       cannot be accessed from the definition of another instance variable
+|}];;
+
+class a = object method m = 3 end
+class b = object inherit a as super val x = super#m end;;
+[%%expect{|
+class a : object method m : int end
+Line 2, characters 44-49:
+2 | class b = object inherit a as super val x = super#m end;;
+                                                ^^^^^
+Error: The instance variable super
+       cannot be accessed from the definition of another instance variable
+|}];;
+
+