@Nullable
 @Override
 public PyType getCallType(
     @Nullable PyExpression receiver,
     @NotNull Map<PyExpression, PyNamedParameter> parameters,
     @NotNull TypeEvalContext context) {
   return analyzeCallType(context.getReturnType(this), receiver, parameters, context);
 }
 @Nullable
 @Override
 public PyType getCallType(
     @NotNull TypeEvalContext context, @NotNull PyQualifiedExpression callSite) {
   PyType type = null;
   for (PyTypeProvider typeProvider : Extensions.getExtensions(PyTypeProvider.EP_NAME)) {
     type = typeProvider.getCallType(this, callSite, context);
     if (type != null) {
       type.assertValid(typeProvider.toString());
       break;
     }
   }
   if (type == null) {
     type = context.getReturnType(this);
   }
   final PyTypeChecker.AnalyzeCallResults results =
       PyTypeChecker.analyzeCallSite(callSite, context);
   if (results != null) {
     return analyzeCallType(type, results.getReceiver(), results.getArguments(), context);
   }
   return type;
 }