diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index 526bae33..df7eecb2 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -78,6 +78,7 @@ from jedi.evaluate import precedence
 from jedi.evaluate import param
 from jedi.evaluate import helpers
 from jedi.evaluate.context import Context
+from jedi.evaluate.instance import AnonymousInstance
 
 
 class Evaluator(object):
@@ -528,13 +529,12 @@ class Evaluator(object):
             elif is_funcdef:
                 return er.AnonymousFunctionExecution(self, parent_context, scope_node)
             elif scope_node.type == 'classdef':
+                class_context = er.ClassContext(self, scope_node, parent_context)
                 if child_is_funcdef:
                     # anonymous instance
-                    raise NotImplementedError
+                    return AnonymousInstance(self, parent_context, class_context)
                 else:
-                    return er.ClassContext(self, scope_node, parent_context)
-            raise DeprecationWarning
-            return self.wrap(scope, parent_context=parent_context)
+                    return class_context
 
         if node.is_scope():
             scope_node = node
diff --git a/jedi/evaluate/instance.py b/jedi/evaluate/instance.py
index dc5d9ab7..7ca87fe3 100644
--- a/jedi/evaluate/instance.py
+++ b/jedi/evaluate/instance.py
@@ -1,12 +1,14 @@
 from abc import abstractproperty
 
-from jedi.common import unite, to_list
+from jedi.common import unite
 from jedi import debug
 from jedi.evaluate import compiled
 from jedi.evaluate.filters import ParserTreeFilter, ContextName, TreeNameDefinition
 from jedi.evaluate.context import Context, LazyKnownContext
 from jedi.evaluate.cache import memoize_default
+from jedi.cache import memoize_method
 from jedi.evaluate import representation as er
+from jedi.evaluate.dynamic import search_params
 
 
 class AbstractInstanceContext(Context):
@@ -181,6 +183,16 @@ class TreeInstance(AbstractInstanceContext):
         return class_context
 
 
+class AnonymousInstance(TreeInstance):
+    def __init__(self, evaluator, parent_context, class_context):
+        super(AnonymousInstance, self).__init__(
+            evaluator,
+            parent_context,
+            class_context,
+            var_args=None
+        )
+
+
 class CompiledInstanceClassFilter(compiled.CompiledObjectFilter):
     def __init__(self, evaluator, instance, compiled_object):
         super(CompiledInstanceClassFilter, self).__init__(
@@ -313,13 +325,19 @@ class InstanceVarArgs(object):
         self._instance = instance
         self._var_args = var_args
 
+    @memoize_method
+    def get_var_args(self):
+        if self._var_args is None:
+            return search_params(self.evaluator, self.parent_context, self.funcdef)
+        return self._var_args
+
     def unpack(self, func=None):
         yield None, LazyKnownContext(self._instance)
-        for values in self._var_args.unpack(func):
+        for values in self._get_var_args.unpack(func):
             yield values
 
     def get_calling_var_args(self):
-        return self._var_args.get_calling_var_args()
+        return self._get_var_args().get_calling_var_args()
 
 
 class InstanceFunctionExecution(er.FunctionExecutionContext):