Codegen in modidier support

Example.Backend/Example.Backend.csproj

@@ -7,7 +7,7 @@
 
         <Nullable>enable</Nullable>
 
-        <LangVersion>9</LangVersion>
+        <LangVersion>12</LangVersion>
         
         <PublishAot>true</PublishAot>
     </PropertyGroup>

Example.Backend/PrinterFactory.cs

@@ -11,7 +11,7 @@ namespace Example.Backend
     {
         private readonly List<IPrinter> _printers = new();
 
-        public IPrinter Create(string printerName)
+        public IPrinter Create(in string printerName)
         {
             Console.WriteLine("Creating printer");
             return new Printer { Name = printerName };