corrective to gof.ext.view_roots

gof/ext.py

@@ -8,6 +8,7 @@ from env import InconsistencyError
 
 __all__ = ['Destroyer',
            'Viewer',
+           'view_roots',
            'DestroyHandler',
            ]
 
@@ -470,7 +471,8 @@ class Viewer:
         """
         raise AbstractFunctionError()
 
-    def view_roots(self, r):
+
+def view_roots(r):
     """
     Utility function that returns the leaves of a search through
     consecutive view_map()s.
@@ -480,11 +482,11 @@ class Viewer:
         try:
             view_map = owner.view_map()
         except AttributeError, AbstractFunctionError:
-                return []
+            return [r]
         if r in view_map:
             answer = []
             for r2 in view_map[r]:
-                    answer.extend(helper(r2))
+                answer += view_roots(r2)
             return answer
         else:
             return [r]