Fix a bug in the ``compiler`` package that caused invalid code to be
generated for generator expressions.
diff --git a/Lib/compiler/symbols.py b/Lib/compiler/symbols.py
index 8eb5fce..8f62980 100644
--- a/Lib/compiler/symbols.py
+++ b/Lib/compiler/symbols.py
@@ -188,7 +188,7 @@
         i = self.__counter
         self.__counter += 1
         self.__super_init("generator expression<%d>"%i, module, klass)
-        self.add_param('[outmost-iterable]')
+        self.add_param('.0')
 
     def get_names(self):
         keys = Scope.get_names(self)