C#: Change ID of buildless output assembly

Author: tamasvajk

csharp/extractor/Semmle.Extraction.CSharp/Entities/Assembly.cs

@@ -9,19 +9,20 @@ internal class Assembly : Extraction.Entities.Location
 
         private readonly string assemblyPath;
         private readonly IAssemblySymbol assembly;
+        private readonly bool isOutputAssembly;
 
         private Assembly(Context cx, Microsoft.CodeAnalysis.Location? init)
             : base(cx, init)
         {
-            if (init is null)
+            isOutputAssembly = init is null;
+            if (isOutputAssembly)
             {
-                // This is the output assembly
                 assemblyPath = cx.Extractor.OutputPath;
                 assembly = cx.Compilation.Assembly;
             }
             else
             {
-                assembly = init.MetadataModule!.ContainingAssembly;
+                assembly = init!.MetadataModule!.ContainingAssembly;
                 var identity = assembly.Identity;
                 var idString = identity.Name + " " + identity.Version;
                 assemblyPath = cx.Extractor.GetAssemblyFile(idString);
@@ -68,8 +69,16 @@ public static Assembly CreateOutputAssembly(Context cx)
 
         public override void WriteId(EscapingTextWriter trapFile)
         {
-            trapFile.Write(assembly.ToString());
-            if (!(assemblyPath is null))
+            if (isOutputAssembly && Context.Extractor.Mode.HasFlag(ExtractorMode.Standalone))
+            {
+                trapFile.Write("buildlessOutputAssembly");
+            }
+            else
+            {
+                trapFile.Write(assembly.ToString());
+            }
+
+            if (assemblyPath is not null)
             {
                 trapFile.Write("#file:///");
                 trapFile.Write(assemblyPath.Replace("\\", "/"));