Fix test output missed previously

src/Compilers/VisualBasic/Test/Semantic/IOperation/IOperationTests.vb

-' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
+' Copyright (c) Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information.
 
 Imports Microsoft.CodeAnalysis.Semantics
 Imports Microsoft.CodeAnalysis.Test.Utilities
@@ -376,7 +376,7 @@ BC30581: 'AddressOf' expression cannot be converted to 'Integer' because 'Intege
     null
   Arguments(1):
       IArgument (ArgumentKind.Explicit, Matching Parameter: x) (OperationKind.Argument) (Syntax: 'Nothing')
-        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32(), Constant: null) (Syntax: 'Nothing')
+        IConversionExpression (Implicit, TryCast: False, Unchecked) (OperationKind.ConversionExpression, Type: System.Int32(), Constant: null, IsImplicit) (Syntax: 'Nothing')
           Conversion: CommonConversion (Exists: True, IsIdentity: False, IsNumeric: False, IsReference: False, IsUserDefined: False) (MethodSymbol: null)
           Operand: 
             ILiteralExpression (OperationKind.LiteralExpression, Type: null, Constant: null) (Syntax: 'Nothing')