Fix some issues with converting names, see #1466

jedi/inference/context.py

@@ -133,6 +133,9 @@ class AbstractContext(object):
     def py__name__(self):
         raise NotImplementedError
 
+    def get_value(self):
+        raise NotImplementedError
+
     @property
     def name(self):
         return None
@@ -200,6 +203,9 @@ class ValueContext(AbstractContext):
     def py__doc__(self):
         return self._value.py__doc__()
 
+    def get_value(self):
+        return self._value
+
     def __repr__(self):
         return '%s(%s)' % (self.__class__.__name__, self._value)
 
@@ -226,6 +232,7 @@ class TreeContextMixin(object):
                     self.inference_state, parent_context.parent_context, class_value)
                 func = value.BoundMethod(
                     instance=instance,
+                    class_context=class_value.as_context(),
                     function=func
                 )
             return func
@@ -365,6 +372,9 @@ class CompForContext(TreeContextMixin, AbstractContext):
     def get_filters(self, until_position=None, origin_scope=None):
         yield ParserTreeFilter(self)
 
+    def get_value(self):
+        return None
+
     def py__name__(self):
         return '<comprehension context>'