From eba90f4871c1e24985a726656d8b6716a6478df3 Mon Sep 17 00:00:00 2001
From: Vlad <hrrrrustic@gmail.com>
Date: Tue, 17 Aug 2021 23:28:45 +0300
Subject: [PATCH] make struct readonly, add IEq<>

---
 .../ref/Microsoft.Extensions.DependencyModel.cs           | 6 +++---
 .../src/Dependency.cs                                     | 8 ++------
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/src/libraries/Microsoft.Extensions.DependencyModel/ref/Microsoft.Extensions.DependencyModel.cs b/src/libraries/Microsoft.Extensions.DependencyModel/ref/Microsoft.Extensions.DependencyModel.cs
index 25cb39d936a98a..332e5066583f27 100644
--- a/src/libraries/Microsoft.Extensions.DependencyModel/ref/Microsoft.Extensions.DependencyModel.cs
+++ b/src/libraries/Microsoft.Extensions.DependencyModel/ref/Microsoft.Extensions.DependencyModel.cs
@@ -46,10 +46,10 @@ public CompilationOptions(System.Collections.Generic.IEnumerable<string> defines
         public bool? PublicSign { get { throw null; } }
         public bool? WarningsAsErrors { get { throw null; } }
     }
-    public partial struct Dependency
+    public readonly partial struct Dependency : System.IEquatable<Dependency>
     {
-        private object _dummy;
-        private int _dummyPrimitive;
+        private readonly object _dummy;
+        private readonly int _dummyPrimitive;
         public Dependency(string name, string version) { throw null; }
         public readonly string Name { get { throw null; } }
         public readonly string Version { get { throw null; } }
diff --git a/src/libraries/Microsoft.Extensions.DependencyModel/src/Dependency.cs b/src/libraries/Microsoft.Extensions.DependencyModel/src/Dependency.cs
index bf51c3a414a42b..5ce3c29cdd3a74 100644
--- a/src/libraries/Microsoft.Extensions.DependencyModel/src/Dependency.cs
+++ b/src/libraries/Microsoft.Extensions.DependencyModel/src/Dependency.cs
@@ -6,7 +6,7 @@
 
 namespace Microsoft.Extensions.DependencyModel
 {
-    public struct Dependency
+    public readonly struct Dependency : IEquatable<Dependency>
     {
         public Dependency(string name, string version)
         {
@@ -30,11 +30,7 @@ public bool Equals(Dependency other)
             return string.Equals(Name, other.Name) && string.Equals(Version, other.Version);
         }
 
-        public override bool Equals(object obj)
-        {
-            if (obj is null) return false;
-            return obj is Dependency && Equals((Dependency) obj);
-        }
+        public override bool Equals(object obj) => obj is Dependency dependency && Equals(dependency);
 
         public override int GetHashCode() =>
             HashHelpers.Combine(Name.GetHashCode(), Version.GetHashCode());