diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index dbf83def..3a5b1747 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -164,7 +164,11 @@ class Evaluator(object):
                     t = self.eval_element(rhs)
                     left = precedence.calculate(self, left, operator, t)
                 types = left
-                del self.predefined_if_name_dict_dict[for_stmt]
+                if ordered:
+                    # If there are no for entries, we cannot iterate and the
+                    # types are defined by += entries. Therefore the for loop
+                    # is never called.
+                    del self.predefined_if_name_dict_dict[for_stmt]
             else:
                 types = precedence.calculate(self, left, operator, types)
         debug.dbg('eval_statement result %s', types)
diff --git a/jedi/evaluate/iterable.py b/jedi/evaluate/iterable.py
index c8928c00..3c6671dd 100644
--- a/jedi/evaluate/iterable.py
+++ b/jedi/evaluate/iterable.py
@@ -406,7 +406,6 @@ def ordered_elements_of_iterable(evaluator, iterable_type, all_values):
             ordered = [literals_to_types(evaluator, all_values)]
             break
         else:
-            # Try
             for i, types in enumerate(sequence.per_index_values()):
                 try:
                     ordered[i] |= types