WIP

* Change Instance.getitem to return all inference results
  pylint-dev#960

astroid/bases.py

@@ -328,7 +328,7 @@ def getitem(self, index, context=None):
             raise exceptions.InferenceError(
                 "Could not find __getitem__ for {node!r}.", node=self, context=context
             )
-        return next(method.infer_call_result(self, new_context))
+        return list(method.infer_call_result(self, new_context))
 
 
 class UnboundMethod(Proxy):

astroid/inference.py

@@ -392,12 +392,15 @@ def infer_subscript(self, context=None):
             ) as exc:
                 raise exceptions.InferenceError(node=self, context=context) from exc
 
+            if not isinstance(assigned, list):
+                assigned = [assigned]
             # Prevent inferring if the inferred subscript
             # is the same as the original subscripted object.
-            if self is assigned or assigned is util.Uninferable:
+            if self in assigned or util.Uninferable in assigned:
                 yield util.Uninferable
                 return None
-            yield from assigned.infer(context)
+            for elm in assigned:
+                yield from elm.infer(context)
             found_one = True
 
     if found_one: