trap BasicObject#singleton_method_added

`BasicObject#singleton_method_added` is correct method.
Now there is no way to track `singleton_method_added`,
so users need to call `super' in `singleton_method_added`.

Author: ko1

lib/debug/session.rb

@@ -1641,6 +1641,7 @@ def resolve_path file
 
     def method_added tp
       b = tp.binding
+
       if var_name = b.local_variables.first
         mid = b.local_variable_get(var_name)
         resolved = true
@@ -1673,6 +1674,10 @@ def method_added tp
     class ::Module
       undef method_added
       def method_added mid; end
+    end
+
+    class ::BasicObject
+      undef singleton_method_added
       def singleton_method_added mid; end
     end
 
@@ -1698,8 +1703,8 @@ def self.deactivate_method_added_trackers
     end
 
     METHOD_ADDED_TRACKERS = Hash.new
-    create_method_added_tracker Module, :method_added,           :instance_method
-    create_method_added_tracker Module, :singleton_method_added, :instance_method
+    create_method_added_tracker Module, :method_added, :instance_method
+    create_method_added_tracker BasicObject, :singleton_method_added, :instance_method
 
     def width
       @ui.width

test/console/break_test.rb

@@ -551,6 +551,30 @@ def test_break_after_user_defined_method_added
         type 'c'
       end
     end
+
+    def program_singleton_method_added
+      <<~RUBY
+         1| class C
+         2|   def self.singleton_method_added mid
+         3|     super # Required. This is curent limitation for user-defined singleton_method_added method
+         4|   end
+         5|   def self.foo
+         6|   end
+         5| end
+         6| C.foo
+      RUBY
+    end
+
+    def test_break_after_user_defined_singleton_method_added
+      debug_code program_singleton_method_added do
+        type 'b C.foo'
+        type 'c'
+        assert_line_num 5
+        type 'c'
+      end
+    end
+
+
   end
 
   #