C#: Extract CIL fields using their underlying types for a reference type field and annotate the field as a reference type.

Author: michaelnebel

csharp/extractor/Semmle.Extraction.CIL/Entities/Field.cs

@@ -1,7 +1,4 @@
-using System;
-using System.Collections.Generic;
-using Microsoft.CodeAnalysis;
-using System.IO;
+using System.Collections.Generic;
 
 namespace Semmle.Extraction.CIL.Entities
 {
@@ -38,6 +35,11 @@ public override IEnumerable<IExtractionProduct> Contents
                     t = mt.Unmodified;
                     yield return Tuples.cil_custom_modifiers(this, mt.Modifier, mt.IsRequired);
                 }
+                if (t is ByRefType brt)
+                {
+                    t = brt.ElementType;
+                    yield return Tuples.cil_type_annotation(this, TypeAnnotation.Ref);
+                }
                 yield return Tuples.cil_field(this, DeclaringType, Name, t);
             }
         }