@NotNull
 protected JetTypeInfo visitAssignment(
     JetBinaryExpression expression, ExpressionTypingContext contextWithExpectedType) {
   ExpressionTypingContext context =
       contextWithExpectedType.replaceExpectedType(TypeUtils.NO_EXPECTED_TYPE).replaceScope(scope);
   JetExpression left =
       context.expressionTypingServices.deparenthesize(expression.getLeft(), context);
   JetExpression right = expression.getRight();
   if (left instanceof JetArrayAccessExpression) {
     JetArrayAccessExpression arrayAccessExpression = (JetArrayAccessExpression) left;
     if (right == null) return JetTypeInfo.create(null, context.dataFlowInfo);
     JetTypeInfo typeInfo =
         basic.resolveArrayAccessSetMethod(arrayAccessExpression, right, context, context.trace);
     basic.checkLValue(context.trace, arrayAccessExpression);
     return JetTypeInfo.create(
         checkAssignmentType(typeInfo.getType(), expression, contextWithExpectedType),
         typeInfo.getDataFlowInfo());
   }
   JetTypeInfo leftInfo = facade.getTypeInfo(expression.getLeft(), context);
   JetType leftType = leftInfo.getType();
   DataFlowInfo dataFlowInfo = leftInfo.getDataFlowInfo();
   if (right != null) {
     JetTypeInfo rightInfo =
         facade.getTypeInfo(
             right, context.replaceDataFlowInfo(dataFlowInfo).replaceExpectedType(leftType));
     dataFlowInfo = rightInfo.getDataFlowInfo();
   }
   if (leftType != null) { // if leftType == null, some another error has been generated
     basic.checkLValue(context.trace, expression.getLeft());
   }
   return DataFlowUtils.checkStatementType(expression, contextWithExpectedType, dataFlowInfo);
 }
 @Override
 public JetTypeInfo visitBinaryExpression(
     JetBinaryExpression expression, ExpressionTypingContext context) {
   JetSimpleNameExpression operationSign = expression.getOperationReference();
   IElementType operationType = operationSign.getReferencedNameElementType();
   JetTypeInfo result;
   if (operationType == JetTokens.EQ) {
     result = visitAssignment(expression, context);
   } else if (OperatorConventions.ASSIGNMENT_OPERATIONS.containsKey(operationType)) {
     result = visitAssignmentOperation(expression, context);
   } else {
     return facade.getTypeInfo(expression, context);
   }
   return DataFlowUtils.checkType(result.getType(), expression, context, result.getDataFlowInfo());
 }
  @NotNull
  protected JetTypeInfo visitAssignmentOperation(
      JetBinaryExpression expression, ExpressionTypingContext contextWithExpectedType) {
    // There is a temporary binding trace for an opportunity to resolve set method for array if
    // needed (the initial trace should be used there)
    TemporaryBindingTrace temporaryBindingTrace =
        TemporaryBindingTrace.create(
            contextWithExpectedType.trace,
            "trace to resolve array set method for binary expression",
            expression);
    ExpressionTypingContext context =
        contextWithExpectedType
            .replaceExpectedType(TypeUtils.NO_EXPECTED_TYPE)
            .replaceBindingTrace(temporaryBindingTrace);

    JetSimpleNameExpression operationSign = expression.getOperationReference();
    IElementType operationType = operationSign.getReferencedNameElementType();
    JetTypeInfo leftInfo = facade.getTypeInfo(expression.getLeft(), context);
    JetType leftType = leftInfo.getType();
    DataFlowInfo dataFlowInfo = leftInfo.getDataFlowInfo();

    JetExpression right = expression.getRight();
    JetExpression left = JetPsiUtil.deparenthesizeWithNoTypeResolution(expression.getLeft());
    if (right == null || left == null) {
      temporaryBindingTrace.commit();
      return JetTypeInfo.create(null, dataFlowInfo);
    }

    if (leftType == null) {
      dataFlowInfo =
          facade.getTypeInfo(right, context.replaceDataFlowInfo(dataFlowInfo)).getDataFlowInfo();
      context.trace.report(UNRESOLVED_REFERENCE.on(operationSign));
      temporaryBindingTrace.commit();
      return JetTypeInfo.create(null, dataFlowInfo);
    }
    ExpressionReceiver receiver = new ExpressionReceiver(left, leftType);

    // We check that defined only one of '+=' and '+' operations, and call it (in the case '+' we
    // then also assign)
    // Check for '+='
    Name name = OperatorConventions.ASSIGNMENT_OPERATIONS.get(operationType);
    TemporaryBindingTrace assignmentOperationTrace =
        TemporaryBindingTrace.create(
            context.trace, "trace to check assignment operation like '+=' for", expression);
    OverloadResolutionResults<FunctionDescriptor> assignmentOperationDescriptors =
        basic.getResolutionResultsForBinaryCall(
            scope,
            name,
            context.replaceBindingTrace(assignmentOperationTrace),
            expression,
            receiver);
    JetType assignmentOperationType =
        OverloadResolutionResultsUtil.getResultType(assignmentOperationDescriptors);

    // Check for '+'
    Name counterpartName =
        OperatorConventions.BINARY_OPERATION_NAMES.get(
            OperatorConventions.ASSIGNMENT_OPERATION_COUNTERPARTS.get(operationType));
    TemporaryBindingTrace binaryOperationTrace =
        TemporaryBindingTrace.create(
            context.trace, "trace to check binary operation like '+' for", expression);
    OverloadResolutionResults<FunctionDescriptor> binaryOperationDescriptors =
        basic.getResolutionResultsForBinaryCall(
            scope,
            counterpartName,
            context.replaceBindingTrace(binaryOperationTrace),
            expression,
            receiver);
    JetType binaryOperationType =
        OverloadResolutionResultsUtil.getResultType(binaryOperationDescriptors);

    JetType type = assignmentOperationType != null ? assignmentOperationType : binaryOperationType;
    if (assignmentOperationType != null && binaryOperationType != null) {
      OverloadResolutionResults<FunctionDescriptor> ambiguityResolutionResults =
          OverloadResolutionResultsUtil.ambiguity(
              assignmentOperationDescriptors, binaryOperationDescriptors);
      context.trace.report(
          ASSIGN_OPERATOR_AMBIGUITY.on(
              operationSign, ambiguityResolutionResults.getResultingCalls()));
      Collection<DeclarationDescriptor> descriptors = Sets.newHashSet();
      for (ResolvedCall<? extends FunctionDescriptor> call :
          ambiguityResolutionResults.getResultingCalls()) {
        descriptors.add(call.getResultingDescriptor());
      }
      dataFlowInfo =
          facade.getTypeInfo(right, context.replaceDataFlowInfo(dataFlowInfo)).getDataFlowInfo();
      context.trace.record(AMBIGUOUS_REFERENCE_TARGET, operationSign, descriptors);
    } else if (assignmentOperationType != null) {
      assignmentOperationTrace.commit();
      if (!KotlinBuiltIns.getInstance().isUnit(assignmentOperationType)) {
        context.trace.report(
            ASSIGNMENT_OPERATOR_SHOULD_RETURN_UNIT.on(
                operationSign,
                assignmentOperationDescriptors.getResultingDescriptor(),
                operationSign));
      }
    } else {
      binaryOperationTrace.commit();
      context.trace.record(VARIABLE_REASSIGNMENT, expression);
      if (left instanceof JetArrayAccessExpression) {
        ExpressionTypingContext contextForResolve =
            context
                .replaceScope(scope)
                .replaceBindingTrace(
                    TemporaryBindingTrace.create(
                        contextWithExpectedType.trace,
                        "trace to resolve array set method for assignment",
                        expression));
        basic.resolveArrayAccessSetMethod(
            (JetArrayAccessExpression) left, right, contextForResolve, context.trace);
      }
      dataFlowInfo =
          facade.getTypeInfo(right, context.replaceDataFlowInfo(dataFlowInfo)).getDataFlowInfo();
    }
    basic.checkLValue(context.trace, expression.getLeft());
    temporaryBindingTrace.commit();
    return JetTypeInfo.create(
        checkAssignmentType(type, expression, contextWithExpectedType), dataFlowInfo);
  }