diff --git a/jedi/api/interpreter.py b/jedi/api/interpreter.py
index e1b909ef..318dc7a7 100644
--- a/jedi/api/interpreter.py
+++ b/jedi/api/interpreter.py
@@ -18,12 +18,16 @@ class InterpreterNamespace(pr.Module):
         self.parser_module = parser_module
         self._evaluator = evaluator
 
+    @underscore_memoization
     def get_defined_names(self):
         for name in self.parser_module.get_defined_names():
             yield name
         for key, value in self.namespace.items():
             yield LazyName(self._evaluator, key, value)
 
+    def scope_names_generator(self, position=None):
+        yield self, list(self.get_defined_names())
+
     def __getattr__(self, name):
         return getattr(self.parser_module, name)
 
diff --git a/jedi/evaluate/compiled/__init__.py b/jedi/evaluate/compiled/__init__.py
index 2f8be3a9..062f14a8 100644
--- a/jedi/evaluate/compiled/__init__.py
+++ b/jedi/evaluate/compiled/__init__.py
@@ -88,6 +88,9 @@ class CompiledObject(Base):
         else:
             return type_names + self.instance_names()
 
+    def scope_names_generator(self, position=None):
+        yield self, self.get_defined_names()
+
     @underscore_memoization
     def instance_names(self):
         names = []
diff --git a/jedi/evaluate/finder.py b/jedi/evaluate/finder.py
index 6557c7d9..2b52cc13 100644
--- a/jedi/evaluate/finder.py
+++ b/jedi/evaluate/finder.py
@@ -435,9 +435,7 @@ def _get_defined_names_for_position(scope, position=None, start_scope=None):
     names = scope.get_defined_names()
     # Instances have special rules, always return all the possible completions,
     # because class variables are always valid and the `self.` variables, too.
-    if not position or isinstance(scope, (iterable.Array, er.Instance, compiled.CompiledObject)) \
-            or start_scope != scope \
-            and isinstance(start_scope, (pr.Function, er.FunctionExecution)):
+    if not position or isinstance(scope, (iterable.Array, er.Instance, compiled.CompiledObject)):
         return names
     names_new = []
     for n in names:
@@ -518,6 +516,10 @@ def get_names_of_scope(evaluator, scope, position=None, star_search=True, includ
             try:
                 if isinstance(scope, (pr.SubModule, fast.Module)):
                     scope = er.ModuleWrapper(evaluator, scope)
+
+                for g in scope.scope_names_generator(position):
+                    yield g
+                """
                 try:
                     sng = scope.scope_names_generator
                 except AttributeError:
@@ -525,6 +527,7 @@ def get_names_of_scope(evaluator, scope, position=None, star_search=True, includ
                 else:
                     for g in sng(position):
                         yield g
+                """
             except StopIteration:
                 reraise(common.MultiLevelStopIteration, sys.exc_info()[2])
         if scope.isinstance(pr.ListComprehension):
diff --git a/jedi/evaluate/representation.py b/jedi/evaluate/representation.py
index f25982b4..ea1eb6d3 100644
--- a/jedi/evaluate/representation.py
+++ b/jedi/evaluate/representation.py
@@ -315,6 +315,10 @@ class Class(use_metaclass(CachedMetaClass, pr.IsScope)):
         type_cls = self._evaluator.find_types(compiled.builtin, 'type')[0]
         return result + list(type_cls.get_defined_names())
 
+    def scope_names_generator(self, position=None):
+        yield self, self.instance_names()
+        yield self, compiled.type_names
+
     def get_subscope_by_name(self, name):
         for s in [self] + self.get_super_classes():
             for sub in reversed(s.subscopes):
@@ -468,6 +472,10 @@ class FunctionExecution(Executable):
         """
         return self._get_params() + pr.Scope.get_defined_names(self)
 
+    def scope_names_generator(self, position=None):
+        names = pr.filter_after_position(pr.Scope.get_defined_names(self), position)
+        yield self, self._get_params() + names
+
     def _copy_properties(self, prop):
         """
         Literally copies a property of a Function. Copying is very expensive,
@@ -541,7 +549,7 @@ class ModuleWrapper(use_metaclass(CachedMetaClass, pr.Module)):
         self._module = module
 
     def scope_names_generator(self, position=None):
-        yield self, filter_after_position(self.get_defined_names(), position)
+        yield self, pr.filter_after_position(self.get_defined_names(), position)
         yield self, self.module_attributes()
         sub_modules = self._sub_modules()
         if sub_modules:
@@ -577,14 +585,3 @@ class ModuleWrapper(use_metaclass(CachedMetaClass, pr.Module)):
 
     def __repr__(self):
         return "<%s: %s>" % (type(self).__name__, self._module)
-
-
-def filter_after_position(names, position):
-    if position is None:
-        return names
-
-    names_new = []
-    for n in names:
-        if n.start_pos[0] is not None and n.start_pos < position:
-            names_new.append(n)
-    return names_new
diff --git a/jedi/parser/representation.py b/jedi/parser/representation.py
index 3572c445..192ee35d 100644
--- a/jedi/parser/representation.py
+++ b/jedi/parser/representation.py
@@ -49,6 +49,17 @@ from jedi.parser import tokenize
 SCOPE_CONTENTS = 'asserts', 'subscopes', 'imports', 'statements', 'returns'
 
 
+def filter_after_position(names, position):
+    if position is None:
+        return names
+
+    names_new = []
+    for n in names:
+        if n.start_pos[0] is not None and n.start_pos < position:
+            names_new.append(n)
+    return names_new
+
+
 class GetCodeState(object):
     """A helper class for passing the state of get_code in a thread-safe
     manner."""
@@ -499,6 +510,9 @@ class Class(Scope):
                     sub.get_call_signature(funcname=self.name.names[-1]), docstr)
         return docstr
 
+    def scope_names_generator(self, position=None):
+        yield self, filter_after_position(self.get_defined_names(), position)
+
 
 class Function(Scope):
     """
@@ -545,6 +559,9 @@ class Function(Scope):
                 debug.warning("multiple names in param %s", n)
         return n
 
+    def scope_names_generator(self, position=None):
+        yield self, filter_after_position(self.get_defined_names(), position)
+
     def get_call_signature(self, width=72, funcname=None):
         """
         Generate call signature of this function.