@Nullable
  @Override
  public PyType getCallType(
      @NotNull TypeEvalContext context, @NotNull PyCallSiteExpression callSite) {
    for (PyTypeProvider typeProvider : Extensions.getExtensions(PyTypeProvider.EP_NAME)) {
      final Ref<PyType> typeRef = typeProvider.getCallType(this, callSite, context);
      if (typeRef != null) {
        return derefType(typeRef, typeProvider);
      }
    }

    final PyExpression receiver = PyTypeChecker.getReceiver(callSite, this);
    final Map<PyExpression, PyNamedParameter> mapping =
        PyCallExpressionHelper.mapArguments(callSite, this, context);
    return getCallType(receiver, mapping, 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;
 }
 @Nullable
 @Override
 public PyType getCallType(
     @NotNull TypeEvalContext context, @NotNull PyCallSiteExpression callSite) {
   for (PyTypeProvider typeProvider : Extensions.getExtensions(PyTypeProvider.EP_NAME)) {
     final PyType type = typeProvider.getCallType(this, callSite, context);
     if (type != null) {
       type.assertValid(typeProvider.toString());
       return type;
     }
   }
   final PyExpression receiver = PyTypeChecker.getReceiver(callSite, this);
   final List<PyExpression> arguments = PyTypeChecker.getArguments(callSite, this);
   final List<PyParameter> parameters = PyUtil.getParameters(this, context);
   final PyResolveContext resolveContext =
       PyResolveContext.noImplicits().withTypeEvalContext(context);
   final List<PyParameter> explicitParameters =
       PyTypeChecker.filterExplicitParameters(parameters, this, callSite, resolveContext);
   final Map<PyExpression, PyNamedParameter> mapping =
       PyCallExpressionHelper.mapArguments(arguments, explicitParameters);
   return getCallType(receiver, mapping, context);
 }