update

Author: v-fuquanli

mdoc/Mono.Documentation/MDocUpdater.Member.cs

@@ -44,6 +44,9 @@ internal static void MakeTypeParameterConstraints(XmlElement root, XmlElement e,
                 AppendElementText(ce, "ParameterAttribute", "NotNullableValueTypeConstraint");
             if ((attrs & GenericParameterAttributes.ReferenceTypeConstraint) != 0)
                 AppendElementText(ce, "ParameterAttribute", "ReferenceTypeConstraint");
+            // Check for 'allows ref struct' constraint
+            if ((attrs & (GenericParameterAttributes)0x0020) != 0) // Assuming 0x1000 is the flag for 'allows ref struct'
+                AppendElementText(ce, "ParameterAttribute", "AllowsRefStruct");
 
 #if NEW_CECIL
             foreach (GenericParameterConstraint c in constraints)

mdoc/Mono.Documentation/Updater/Formatters/CSharpFullMemberFormatter.cs

@@ -314,9 +314,10 @@ private StringBuilder AppendConstraints (StringBuilder buf, IList<GenericParamet
                 bool isref = (attrs & GenericParameterAttributes.ReferenceTypeConstraint) != 0;
                 bool isvt = (attrs & GenericParameterAttributes.NotNullableValueTypeConstraint) != 0;
                 bool isnew = (attrs & GenericParameterAttributes.DefaultConstructorConstraint) != 0;
+                bool isAllowsRefStruct = (attrs & (GenericParameterAttributes)0x0020) != 0; // Assuming 0x0020 is the flag for 'allows ref struct'
                 bool comma = false;
 
-                if (!isref && !isvt && !isnew && constraints.Count == 0)
+                if (!isref && !isvt && !isAllowsRefStruct && !isnew && constraints.Count == 0)
                     continue;
                 buf.Append (" where ").Append (genArg.Name).Append (" : ");
                 if (isref)
@@ -350,6 +351,14 @@ private StringBuilder AppendConstraints (StringBuilder buf, IList<GenericParamet
                         buf.Append (", ");
                     buf.Append ("new()");
                 }
+
+                // Handle 'allows ref struct' constraint
+                if (isAllowsRefStruct)
+                {
+                    if (comma || constraints.Count > 0 || isref || isvt || isnew)
+                        buf.Append(", ");
+                    buf.Append("allows ref struct");
+                }
             }
             return buf;
         }