Mark applicable structs as readonly

7 files changed, 7 insertions, 7 deletions

diff --git a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.HashBucket.cs b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.HashBucket.cs
index 44376e9515..0d05920bab 100644
--- a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.HashBucket.cs
+++ b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.HashBucket.cs
@@ -15,7 +15,7 @@ namespace System.Collections.Immutable
         /// <summary>
         /// Contains all the key/values in the collection that hash to the same value.
         /// </summary>
-        internal struct HashBucket : IEnumerable<KeyValuePair<TKey, TValue>>
+        internal readonly struct HashBucket : IEnumerable<KeyValuePair<TKey, TValue>>
         {
             /// <summary>
             /// One of the values in this bucket.
diff --git a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.MutationInput.cs b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.MutationInput.cs
index 277ef993b0..22c3462aba 100644
--- a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.MutationInput.cs
+++ b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.MutationInput.cs
@@ -15,7 +15,7 @@ namespace System.Collections.Immutable
         /// Description of the current data structure as input into a
         /// mutating or query method.
         /// </summary>
-        private struct MutationInput
+        private readonly struct MutationInput
         {
             /// <summary>
             /// The root of the data structure for the collection.
diff --git a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.MutationResult.cs b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.MutationResult.cs
index b3fb207ea0..1872f38ceb 100644
--- a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.MutationResult.cs
+++ b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableDictionary_2.MutationResult.cs
@@ -12,7 +12,7 @@ namespace System.Collections.Immutable
         /// <summary>
         /// Describes the result of a mutation on the immutable data structure.
         /// </summary>
-        private struct MutationResult
+        private readonly struct MutationResult
         {
             /// <summary>
             /// The root node of the data structure after the mutation.
diff --git a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.HashBucket.cs b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.HashBucket.cs
index dc0382dbcd..cd232e9533 100644
--- a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.HashBucket.cs
+++ b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.HashBucket.cs
@@ -31,7 +31,7 @@ namespace System.Collections.Immutable
         /// <summary>
         /// Contains all the keys in the collection that hash to the same value.
         /// </summary>
-        internal struct HashBucket
+        internal readonly struct HashBucket
         {
             /// <summary>
             /// One of the values in this bucket.
diff --git a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.MutationInput.cs b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.MutationInput.cs
index 5879ff1bb5..1c0ab7a81c 100644
--- a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.MutationInput.cs
+++ b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.MutationInput.cs
@@ -15,7 +15,7 @@ namespace System.Collections.Immutable
         /// Description of the current data structure as input into a
         /// mutating or query method.
         /// </summary>
-        private struct MutationInput
+        private readonly struct MutationInput
         {
             /// <summary>
             /// The root of the data structure for the collection.
diff --git a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.MutationResult.cs b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.MutationResult.cs
index 245c2934d2..89e88b72b0 100644
--- a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.MutationResult.cs
+++ b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.MutationResult.cs
@@ -28,7 +28,7 @@ namespace System.Collections.Immutable
         /// <summary>
         /// Describes the result of a mutation on the immutable data structure.
         /// </summary>
-        private struct MutationResult
+        private readonly struct MutationResult
         {
             /// <summary>
             /// The root node of the data structure after the mutation.
diff --git a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.NodeEnumerable.cs b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.NodeEnumerable.cs
index 8d6badb592..706bd1493e 100644
--- a/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.NodeEnumerable.cs
+++ b/src/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet_1.NodeEnumerable.cs
@@ -15,7 +15,7 @@ namespace System.Collections.Immutable
         /// <summary>
         /// Enumerates over a sorted dictionary used for hash buckets.
         /// </summary>
-        private struct NodeEnumerable : IEnumerable<T>
+        private readonly struct NodeEnumerable : IEnumerable<T>
         {
             /// <summary>
             /// The root of the sorted dictionary to enumerate.