diff --git a/jedi/evaluate/context/function.py b/jedi/evaluate/context/function.py
index ad1069d1..d9efd75b 100644
--- a/jedi/evaluate/context/function.py
+++ b/jedi/evaluate/context/function.py
@@ -306,10 +306,12 @@ class OverloadedFunctionContext(object):
         for f in self._overloaded_functions:
             signature = parser_utils.get_call_signature(f.tree_node)
             if signature_matches(f, arguments):
-                debug.dbg("Overloading - signature %s matches", signature, color='BLUE')
+                debug.dbg("Overloading - signature %s@%s matches",
+                          signature, f.tree_node.start_pos[0], color='BLUE')
                 context_set |= f.py__call__(arguments=arguments)
             else:
-                debug.dbg("Overloading - signature %s doesn't match", signature, color='BLUE')
+                debug.dbg("Overloading - signature %s@%s doesn't match with (%s)",
+                          signature, f.tree_node.start_pos[0], arguments, color='BLUE')
         return context_set
 
     def __getattr__(self, name):
@@ -339,6 +341,12 @@ def signature_matches(function_context, arguments):
 
 
 def has_same_class(context_set1, context_set2):
+    for c1 in context_set1:
+        for c2 in context_set2:
+            if c1.name.string_name == c2.name.string_name:
+                # TODO This is wrong, it doesn't account for a lot of things.
+                return True
+
     return bool(context_set1 & context_set2)
 
 
diff --git a/jedi/evaluate/context/instance.py b/jedi/evaluate/context/instance.py
index 28b28051..224fcfbe 100644
--- a/jedi/evaluate/context/instance.py
+++ b/jedi/evaluate/context/instance.py
@@ -490,3 +490,6 @@ class InstanceArguments(AbstractArguments):
             return self._var_args.get_executed_params(execution_context)
 
         return super(InstanceArguments, self).get_executed_params(execution_context)
+
+    def __repr__(self):
+        return '<%s: %s>' % (self.__class__.__name__, self._var_args)
diff --git a/jedi/evaluate/context/typing.py b/jedi/evaluate/context/typing.py
index d1182dc6..f29cb015 100644
--- a/jedi/evaluate/context/typing.py
+++ b/jedi/evaluate/context/typing.py
@@ -212,7 +212,9 @@ def _find_type_alias_class(evaluator, module_context, module_name, class_name):
     classes = module.py__getattribute__(class_name)
     # There should only be one, because it's code that we control.
     assert len(classes) == 1, classes
-    return next(iter(classes))
+    cls = next(iter(classes))
+    assert isinstance(cls, ClassContext), cls
+    return cls
 
 
 class _ContainerBase(_WithIndexBase):
diff --git a/test/completion/pep0484_typing.py b/test/completion/pep0484_typing.py
index 58037934..0417ce3b 100644
--- a/test/completion/pep0484_typing.py
+++ b/test/completion/pep0484_typing.py
@@ -40,6 +40,8 @@ def we_can_has_sequence(p, q, r, s, t, u):
     t[1]
     #? ["append"]
     u.a
+    #?
+    u[1.0]
     #? float()
     u[1]