diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index 0381c04d..f858e136 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -275,8 +275,11 @@ class Evaluator(object):
             # This must be an execution, either () or [].
             if current.type == pr.Array.LIST:
                 if hasattr(typ, 'get_index_types'):
-                    slc = iterable.create_indexes_or_slices(self, current)
-                    result = typ.get_index_types(slc)
+                    if isinstance(typ, compiled.CompiledObject):
+                        # CompiledObject doesn't contain an evaluator instance.
+                        result = typ.get_index_types(self, current)
+                    else:
+                        result = typ.get_index_types(current)
             elif current.type not in [pr.Array.DICT]:
                 # Scope must be a class or func - make an instance or execution.
                 result = self.execute(typ, current)
diff --git a/jedi/evaluate/compiled/__init__.py b/jedi/evaluate/compiled/__init__.py
index df82cbb8..4d4c106a 100644
--- a/jedi/evaluate/compiled/__init__.py
+++ b/jedi/evaluate/compiled/__init__.py
@@ -99,7 +99,7 @@ class CompiledObject(Base):
         else:
             raise KeyError("CompiledObject doesn't have an attribute '%s'." % name)
 
-    def get_index_types(self, index_types):
+    def get_index_types(self, evaluator, index_array):
         # If the object doesn't have `__getitem__`, just raise the
         # AttributeError.
         if not hasattr(self.obj, '__getitem__'):
@@ -110,7 +110,8 @@ class CompiledObject(Base):
             return []
 
         result = []
-        for typ in index_types:
+        from jedi.evaluate.iterable import create_indexes_or_slices
+        for typ in create_indexes_or_slices(evaluator, index_array):
             index = None
             try:
                 index = typ.obj
diff --git a/jedi/evaluate/finder.py b/jedi/evaluate/finder.py
index 4182dc21..f7c6683e 100644
--- a/jedi/evaluate/finder.py
+++ b/jedi/evaluate/finder.py
@@ -356,7 +356,7 @@ def _check_isinstance_type(evaluator, stmt, search_name_part):
 
     result = []
     for c in evaluator.eval_call(classes[0]):
-        for typ in (c.get_index_types() if isinstance(c, iterable.Array) else [c]):
+        for typ in (c.values() if isinstance(c, iterable.Array) else [c]):
             result += evaluator.execute(typ)
     return result
 
diff --git a/jedi/evaluate/iterable.py b/jedi/evaluate/iterable.py
index 1742c133..9ff78e65 100644
--- a/jedi/evaluate/iterable.py
+++ b/jedi/evaluate/iterable.py
@@ -60,7 +60,7 @@ class Generator(use_metaclass(CachedMetaClass, pr.Base)):
         """ returns the content of __iter__ """
         return self._evaluator.execute(self.func, self.var_args, True)
 
-    def get_index_types(self, index=None):
+    def get_index_types(self, index_array):
         debug.warning('Tried to get array access on a generator: %s', self)
         return []
 
@@ -99,13 +99,13 @@ class Array(use_metaclass(CachedMetaClass, pr.Base)):
         self._array = array
 
     @memoize_default(NO_DEFAULT)
-    def get_index_types(self, indexes=()):
+    def get_index_types(self, index_array=()):
         """
         Get the types of a specific index or all, if not given.
 
         :param indexes: The index input types.
         """
-        result = []
+        indexes = create_indexes_or_slices(self._evaluator, index_array)
         if [index for index in indexes if isinstance(index, Slice)]:
             return [self]
 
@@ -118,6 +118,10 @@ class Array(use_metaclass(CachedMetaClass, pr.Base)):
                 with common.ignored(KeyError, IndexError, TypeError):
                     return self.get_exact_index_types(index.obj)
 
+        return self.values()
+
+    @memoize_default(NO_DEFAULT)
+    def values(self):
         result = list(_follow_values(self._evaluator, self._array.values))
         result += check_array_additions(self._evaluator, self)
         return result
@@ -228,22 +232,22 @@ def get_iterator_types(inputs):
 
     result = []
     from jedi.evaluate.representation import Instance
-    for gen in iterators:
-        if isinstance(gen, Array):
+    for it in iterators:
+        if isinstance(it, Array):
             # Array is a little bit special, since this is an internal
             # array, but there's also the list builtin, which is
             # another thing.
-            result += gen.get_index_types()
-        elif isinstance(gen, Instance):
+            result += it.values()
+        elif isinstance(it, Instance):
             # __iter__ returned an instance.
             name = '__next__' if is_py3 else 'next'
             try:
-                result += gen.execute_subscope_by_name(name)
+                result += it.execute_subscope_by_name(name)
             except KeyError:
-                debug.warning('Instance has no __next__ function in %s.', gen)
+                debug.warning('Instance has no __next__ function in %s.', it)
         else:
-            # is a generator
-            result += gen.iter_content()
+            # Is a generator.
+            result += it.iter_content()
     return result
 
 
diff --git a/jedi/evaluate/representation.py b/jedi/evaluate/representation.py
index e367c10a..c9b886d4 100644
--- a/jedi/evaluate/representation.py
+++ b/jedi/evaluate/representation.py
@@ -168,7 +168,9 @@ class Instance(use_metaclass(CachedMetaClass, Executable)):
         except KeyError:
             return False
 
-    def get_index_types(self, indexes=[]):
+    def get_index_types(self, index_array):
+
+        indexes = iterable.create_indexes_or_slices(self._evaluator, index_array)
         if any([isinstance(i, iterable.Slice) for i in indexes]):
             # Slice support in Jedi is very marginal, at the moment, so just
             # ignore them in case of __getitem__.
diff --git a/test/static_analysis/attribute_error.py b/test/static_analysis/attribute_error.py
index a5a243e1..ac83b792 100644
--- a/test/static_analysis/attribute_error.py
+++ b/test/static_analysis/attribute_error.py
@@ -17,8 +17,7 @@ class Cls():
 
     def defined_lookup(self, obj):
         """
-        Uses an arbitrary object and performs an operation on it, shouldn't
-        be a problem.
+        `obj` is defined by a call into this function.
         """
         obj.upper
         #! attribute-error