diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index 46838e41..1b844f53 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -124,11 +124,19 @@ class Evaluator(object):
 
         result = self.eval_expression_list(expression_list)
 
-        # Assignment checking is only important if the statement defines multiple
-        # variables.
-        if len(stmt.get_set_vars()) > 1 and seek_name and stmt.assignment_details:
+        ass_details = stmt.assignment_details
+        if ass_details and ass_details[0][1] != '=' and False:
+            expr_list, operator = ass_details[0]
+            name = str(expr_list[0].name)
+            start_pos = stmt.start_pos[0] - 1, stmt.start_pos[1] + 30000
+            left_result = self.find_types(stmt.parent, name, start_pos)
+            # `=` is always the last character in aug assignments
+            result = precedence.calculate(left_result, operator[:-1], result)
+        elif len(stmt.get_set_vars()) > 1 and seek_name and ass_details:
+            # Assignment checking is only important if the statement defines
+            # multiple variables.
             new_result = []
-            for ass_expression_list, op in stmt.assignment_details:
+            for ass_expression_list, op in ass_details:
                 new_result += finder.find_assignments(ass_expression_list[0], result, seek_name)
             result = new_result
         return set(result)
@@ -277,7 +285,7 @@ class Evaluator(object):
                 # This is the typical lookup while chaining things.
                 if filter_private_variable(typ, scope, current):
                     return []
-            types = self.find_types(typ, current, position=position)
+            types = self.find_types(typ, current, position=None)
             result = imports.strip_imports(self, types)
         return self.follow_path(path, set(result), scope, position=position)
 
diff --git a/jedi/evaluate/compiled/__init__.py b/jedi/evaluate/compiled/__init__.py
index ed196ae7..caf34a51 100644
--- a/jedi/evaluate/compiled/__init__.py
+++ b/jedi/evaluate/compiled/__init__.py
@@ -279,6 +279,8 @@ class Builtin(CompiledObject):
         # access it.
         return [d for d in super(Builtin, self).get_defined_names() if d.name != 'None']
 
+    get_set_vars = get_defined_names
+
 
 def _a_generator(foo):
     """Used to have an object to return for generators."""
diff --git a/jedi/evaluate/finder.py b/jedi/evaluate/finder.py
index e8e4475a..e8b47b39 100644
--- a/jedi/evaluate/finder.py
+++ b/jedi/evaluate/finder.py
@@ -24,7 +24,7 @@ class NameFinder(object):
     def find(self, scopes, resolve_decorator=True):
         names = self.filter_name(scopes)
         types = self._names_to_types(names, resolve_decorator)
-        debug.dbg('_names_to_types: %s, old: %s', names, types)
+        debug.dbg('finder._names_to_types: %s, old: %s', names, types)
         return self._resolve_descriptors(types)
 
     def scopes(self, search_global=False):
@@ -34,7 +34,7 @@ class NameFinder(object):
             if isinstance(self.scope, er.Instance):
                 return self.scope.scope_generator()
             else:
-                if isinstance(self.scope, (er.Class, pr.Module)):
+                if isinstance(self.scope, er.Class):
                     # classes are only available directly via chaining?
                     # strange stuff...
                     names = self.scope.get_defined_names()
@@ -78,7 +78,7 @@ class NameFinder(object):
                     new_name.parent = r
                     result.append(new_name)
 
-        debug.dbg('sfn filter "%s" in (%s-%s): %s@%s', self.name_str,
+        debug.dbg('finder.filter_name "%s" in (%s-%s): %s@%s', self.name_str,
                   self.scope, nscope, u(result), self.position)
         return result
 
@@ -105,12 +105,7 @@ class NameFinder(object):
         """
         par = name.parent
         if par.isinstance(pr.Statement):
-            details = par.assignment_details
-            if details and details[0][1] != '=':
-                return True
-
-            if isinstance(name, er.InstanceElement) \
-                    and not name.is_class_var:
+            if isinstance(name, er.InstanceElement) and not name.is_class_var:
                 return True
         elif isinstance(par, pr.Import) and len(par.namespace) > 1:
             # TODO multi-level import non-breakable
@@ -351,9 +346,9 @@ 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))
-       or start_scope != scope
-       and isinstance(start_scope, (pr.Function, er.FunctionExecution))):
+    if not position or isinstance(scope, (iterable.Array, er.Instance, compiled.CompiledObject)) \
+            or start_scope != scope \
+            and isinstance(start_scope, (pr.Function, er.FunctionExecution)):
         return names
     names_new = []
     for n in names: