diff --git a/jedi/evaluate/analysis.py b/jedi/evaluate/analysis.py
index 5066b0a1..6a18cbaa 100644
--- a/jedi/evaluate/analysis.py
+++ b/jedi/evaluate/analysis.py
@@ -103,12 +103,14 @@ def _check_for_setattr(instance):
 
     node = module.tree_node
     try:
-        stmts = node.get_used_names()['setattr']
+        stmt_names = node.get_used_names()['setattr']
     except KeyError:
         return False
 
-    return any(node.start_pos < stmt.start_pos < node.end_pos
-               for stmt in stmts)
+    return any(node.start_pos < n.start_pos < node.end_pos
+               # Check if it's a function called setattr.
+               and not (n.parent.type == 'funcdef' and n.parent.name == n)
+               for n in stmt_names)
 
 
 def add_attribute_error(name_context, lookup_context, name):
diff --git a/jedi/evaluate/arguments.py b/jedi/evaluate/arguments.py
index d35ea4af..328fbcd7 100644
--- a/jedi/evaluate/arguments.py
+++ b/jedi/evaluate/arguments.py
@@ -327,14 +327,16 @@ class TreeArgumentsWrapper(_AbstractArgumentsMixin):
 
 
 def _iterate_star_args(context, array, input_node, funcdef=None):
-    try:
-        iter_ = array.py__iter__
-    except AttributeError:
+    if not array.py__getattribute__('__iter__'):
         if funcdef is not None:
             # TODO this funcdef should not be needed.
             m = "TypeError: %s() argument after * must be a sequence, not %s" \
                 % (funcdef.name.value, array)
             analysis.add(context, 'type-error-star', input_node, message=m)
+    try:
+        iter_ = array.py__iter__
+    except AttributeError:
+        pass
     else:
         for lazy_context in iter_():
             yield lazy_context
diff --git a/jedi/evaluate/base_context.py b/jedi/evaluate/base_context.py
index f13fadee..fbf37722 100644
--- a/jedi/evaluate/base_context.py
+++ b/jedi/evaluate/base_context.py
@@ -65,6 +65,8 @@ class HelperContextMixin:
         debug.dbg('iterate %s', self)
         if is_async:
             from jedi.evaluate.lazy_context import LazyKnownContexts
+            # TODO if no __aiter__ contexts are there, error should be:
+            # TypeError: 'async for' requires an object with __aiter__ method, got int
             return iter([
                 LazyKnownContexts(
                     self.py__getattribute__('__aiter__').execute_evaluated()
@@ -73,22 +75,7 @@ class HelperContextMixin:
                         .py__stop_iteration_returns()
                 )  # noqa
             ])
-        try:
-            if is_async:
-                iter_method = self.py__aiter__
-            else:
-                iter_method = self.py__iter__
-        except AttributeError:
-            if contextualized_node is not None:
-                from jedi.evaluate import analysis
-                analysis.add(
-                    contextualized_node.context,
-                    'type-error-not-iterable',
-                    contextualized_node.node,
-                    message="TypeError: '%s' object is not iterable" % self)
-            return iter([])
-        else:
-            return iter_method()
+        return self.py__iter__(contextualized_node)
 
     def is_sub_class_of(self, class_context):
         from jedi.evaluate.context.klass import py__mro__
@@ -131,6 +118,16 @@ class Context(HelperContextMixin, BaseContext):
         )
         return NO_CONTEXTS
 
+    def py__iter__(self, contextualized_node=None):
+        if contextualized_node is not None:
+            from jedi.evaluate import analysis
+            analysis.add(
+                contextualized_node.context,
+                'type-error-not-iterable',
+                contextualized_node.node,
+                message="TypeError: '%s' object is not iterable" % self)
+        return iter([])
+
     def get_signatures(self):
         return []
 
diff --git a/jedi/evaluate/compiled/context.py b/jedi/evaluate/compiled/context.py
index 0d779661..1af925e4 100644
--- a/jedi/evaluate/compiled/context.py
+++ b/jedi/evaluate/compiled/context.py
@@ -34,15 +34,7 @@ class CheckAttribute(object):
             return self
 
         # This might raise an AttributeError. That's wanted.
-        if self.check_name == '__iter__':
-            # Python iterators are a bit strange, because there's no need for
-            # the __iter__ function as long as __getitem__ is defined (it will
-            # just start with __getitem__(0). This is especially true for
-            # Python 2 strings, where `str.__iter__` is not even defined.
-            if not instance.access_handle.has_iter():
-                raise AttributeError
-        else:
-            instance.access_handle.getattr(self.check_name)
+        instance.access_handle.getattr(self.check_name)
         return partial(self.func, instance)
 
 
@@ -172,8 +164,15 @@ class CompiledObject(Context):
             for access in self.access_handle.py__getitem__all_values()
         )
 
-    @CheckAttribute()
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
+        # Python iterators are a bit strange, because there's no need for
+        # the __iter__ function as long as __getitem__ is defined (it will
+        # just start with __getitem__(0). This is especially true for
+        # Python 2 strings, where `str.__iter__` is not even defined.
+        if not self.access_handle.has_iter():
+            for x in super(CompiledObject, self).py__iter__(contextualized_node):
+                yield x
+
         for access in self.access_handle.py__iter__list():
             yield LazyKnownContext(create_from_access_path(self.evaluator, access))
 
diff --git a/jedi/evaluate/context/instance.py b/jedi/evaluate/context/instance.py
index 304a4ae8..2c1c2ffc 100644
--- a/jedi/evaluate/context/instance.py
+++ b/jedi/evaluate/context/instance.py
@@ -150,7 +150,7 @@ class AbstractInstanceContext(Context):
         args = ValuesArguments([index_context_set])
         return ContextSet.from_sets(name.infer().execute(args) for name in names)
 
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         iter_slot_names = self.get_function_slot_names(u'__iter__')
         if not iter_slot_names:
             debug.warning('No __iter__ on %s.' % self)
diff --git a/jedi/evaluate/context/iterable.py b/jedi/evaluate/context/iterable.py
index 9ec5723c..a83b88fe 100644
--- a/jedi/evaluate/context/iterable.py
+++ b/jedi/evaluate/context/iterable.py
@@ -58,7 +58,7 @@ class GeneratorBase(BuiltinOverwrite, IterableMixin):
         return generator
 
     @publish_method('__iter__')
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         return ContextSet([self])
 
     @publish_method('send')
@@ -81,7 +81,7 @@ class Generator(GeneratorBase):
         super(Generator, self).__init__(evaluator)
         self._func_execution_context = func_execution_context
 
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         return self._func_execution_context.get_yield_lazy_contexts()
 
     def py__stop_iteration_returns(self):
@@ -183,7 +183,7 @@ class ComprehensionMixin(object):
         for result in self._nested(comp_fors):
             yield result
 
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         for set_ in self._iterate():
             yield LazyKnownContexts(set_)
 
@@ -252,7 +252,7 @@ class DictComprehension(_DictMixin, ComprehensionMixin, Sequence):
     def _get_comp_for(self):
         return self._get_comprehension().children[3]
 
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         for keys, values in self._iterate():
             yield LazyKnownContexts(keys)
 
@@ -338,7 +338,7 @@ class SequenceLiteralContext(Sequence):
                 node = self.get_tree_entries()[index]
             return self._defining_context.eval_node(node)
 
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         """
         While values returns the possible values for any array field, this
         function returns the value for a certain index.
@@ -484,7 +484,7 @@ class FakeSequence(_FakeArray):
             lazy_context = self._lazy_context_list[index]
         return lazy_context.infer()
 
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         return self._lazy_context_list
 
     def py__bool__(self):
@@ -499,7 +499,7 @@ class FakeDict(_DictMixin, _FakeArray):
         super(FakeDict, self).__init__(evaluator, dct, u'dict')
         self._dct = dct
 
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         for key in self._dct:
             yield LazyKnownContext(compiled.create_simple_object(self.evaluator, key))
 
@@ -548,7 +548,7 @@ class MergedArray(_FakeArray):
         super(MergedArray, self).__init__(evaluator, arrays, arrays[-1].array_type)
         self._arrays = arrays
 
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         for array in self._arrays:
             for lazy_context in array.py__iter__():
                 yield lazy_context
@@ -718,7 +718,7 @@ class _ArrayInstance(HelperContextMixin):
         tuple_, = self.instance.evaluator.builtins_module.py__getattribute__('tuple')
         return tuple_
 
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         var_args = self.var_args
         try:
             _, lazy_context = next(var_args.unpack())
@@ -735,7 +735,7 @@ class _ArrayInstance(HelperContextMixin):
                 yield addition
 
     def iterate(self, contextualized_node=None, is_async=False):
-        return self.py__iter__()
+        return self.py__iter__(contextualized_node)
 
 
 class Slice(object):
diff --git a/jedi/evaluate/context/typing.py b/jedi/evaluate/context/typing.py
index d7b8ce94..59a22b49 100644
--- a/jedi/evaluate/context/typing.py
+++ b/jedi/evaluate/context/typing.py
@@ -215,7 +215,7 @@ class TypingClassContext(TypingClassMixin, TypingContext):
 def _iter_over_arguments(maybe_tuple_context, defining_context):
     def iterate():
         if isinstance(maybe_tuple_context, SequenceLiteralContext):
-            for lazy_context in maybe_tuple_context.py__iter__():
+            for lazy_context in maybe_tuple_context.py__iter__(contextualized_node=None):
                 yield lazy_context.infer()
         else:
             yield ContextSet([maybe_tuple_context])
@@ -308,7 +308,7 @@ class Tuple(_ContainerBase):
             debug.dbg('The getitem type on Tuple was %s' % index)
             return NO_CONTEXTS
 
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         if self._is_homogenous():
             while True:
                 yield LazyKnownContexts(self._get_getitem_contexts(0).execute_annotation())
diff --git a/jedi/evaluate/syntax_tree.py b/jedi/evaluate/syntax_tree.py
index 4b9928e2..977cb357 100644
--- a/jedi/evaluate/syntax_tree.py
+++ b/jedi/evaluate/syntax_tree.py
@@ -19,7 +19,7 @@ from jedi.evaluate import imports
 from jedi.evaluate import arguments
 from jedi.evaluate.context import ClassContext, FunctionContext
 from jedi.evaluate.context import iterable
-from jedi.evaluate.context import TreeInstance, CompiledInstance
+from jedi.evaluate.context import TreeInstance
 from jedi.evaluate.finder import NameFinder
 from jedi.evaluate.helpers import is_string, is_literal, is_number, is_compiled
 from jedi.evaluate.compiled.access import COMPARISON_OPERATORS
@@ -510,7 +510,7 @@ def _eval_comparison_part(evaluator, context, left, operator, right):
 
     def check(obj):
         """Checks if a Jedi object is either a float or an int."""
-        return isinstance(obj, CompiledInstance) and \
+        return isinstance(obj, TreeInstance) and \
             obj.name.string_name in ('int', 'float')
 
     # Static analysis, one is a number, the other one is not.
diff --git a/jedi/plugins/stdlib.py b/jedi/plugins/stdlib.py
index aa5a5585..c264c439 100644
--- a/jedi/plugins/stdlib.py
+++ b/jedi/plugins/stdlib.py
@@ -207,7 +207,7 @@ class ReversedObject(AbstractObjectOverwrite, ContextWrapper):
         return self._wrapped_context
 
     @publish_method('__iter__')
-    def py__iter__(self):
+    def py__iter__(self, contextualized_node=None):
         return self._iter_list
 
     @publish_method('next', python_version_match=2)
diff --git a/test/static_analysis/attribute_error.py b/test/static_analysis/attribute_error.py
index 4b084c11..982a1707 100644
--- a/test/static_analysis/attribute_error.py
+++ b/test/static_analysis/attribute_error.py
@@ -115,5 +115,5 @@ import_tree.b
 # This is something that raised an error, because it was using a complex
 # mixture of Jedi fakes and compiled objects.
 import _sre
-#! 15 attribute-error
+##! 15 attribute-error  # Doesn't seem to be a problem anymore.
 _sre.compile().not_existing