private static Task <Document> ApplyNonSerializedWithTargetFixAsync(CodeFixContext context, SyntaxNode syntaxRoot, EventFieldDeclarationSyntax field)
{
var updated = field.AddAttributeLists(NonSerializedWithTargetSpecifier);
return(Task.FromResult(context.Document.WithSyntaxRoot(syntaxRoot.ReplaceNode(field, updated))));
}