Try to use a CompiledStubClass to wrap functions inside classes

jedi/evaluate/arguments.py

@@ -4,7 +4,7 @@ from parso.python import tree
 
 from jedi._compatibility import zip_longest
 from jedi import debug
-from jedi.evaluate.utils import to_list, PushBackIterator
+from jedi.evaluate.utils import PushBackIterator
 from jedi.evaluate import analysis
 from jedi.evaluate.lazy_context import LazyKnownContext, LazyKnownContexts, \
     LazyTreeContext, get_merged_lazy_context

jedi/evaluate/context/instance.py

@@ -303,11 +303,9 @@ class TreeInstance(AbstractInstanceContext):
         filter = next(self.class_context.get_filters())
         for init_name in filter.get('__init__'):
             for init in init_name.infer():
-                if isinstance(init, OverloadedFunctionContext):
-                    for func in init.overloaded_functions:
-                        yield func
-                elif isinstance(init, FunctionContext):
-                    yield init
+                if init.is_function():
+                    for signature in init.get_signatures():
+                        yield signature.context
 
 
 class AnonymousInstance(TreeInstance):

jedi/evaluate/signature.py

@@ -3,12 +3,12 @@ from abc import abstractproperty
 
 class AbstractSignature(object):
     def __init__(self, context, is_bound=False):
-        self._context = context
+        self.context = context
         self.is_bound = is_bound
 
     @abstractproperty
     def name(self):
-        return self._context.name
+        return self.context.name
 
     def annotation(self):
         return None
@@ -44,7 +44,7 @@ class TreeSignature(AbstractSignature):
 class BuiltinSignature(AbstractSignature):
     @property
     def _function_context(self):
-        return self._context
+        return self.context
 
     def bind(self):
         raise NotImplementedError('pls implement, need test case')