Marking Memory struct as readonly, fixing corefx#23809 (#14684)

ahsonkhan · safern · commit f5cb4dd1dc02 · 2018-01-16T13:09:54.000-08:00
Signed-off-by: dotnet-bot-corefx-mirror &lt;dotnet-bot@microsoft.com&gt;
diff --git a/src/Common/src/CoreLib/System/Memory.cs b/src/Common/src/CoreLib/System/Memory.cs
@@ -14,7 +14,7 @@ namespace System
 {
     [DebuggerDisplay("{DebuggerDisplay,nq}")]
     [DebuggerTypeProxy(typeof(MemoryDebugView<>))]
-    public struct Memory<T>
+    public readonly struct Memory<T>
     {
         // NOTE: With the current implementation, Memory<T> and ReadOnlyMemory<T> must have the same layout,
         // as code uses Unsafe.As to cast between them.
diff --git a/src/Common/src/CoreLib/System/ReadOnlyMemory.cs b/src/Common/src/CoreLib/System/ReadOnlyMemory.cs
@@ -14,7 +14,7 @@ namespace System
 {
     [DebuggerDisplay("{DebuggerDisplay,nq}")]
     [DebuggerTypeProxy(typeof(MemoryDebugView<>))]
-    public struct ReadOnlyMemory<T>
+    public readonly struct ReadOnlyMemory<T>
     {
         // NOTE: With the current implementation, Memory<T> and ReadOnlyMemory<T> must have the same layout,
         // as code uses Unsafe.As to cast between them.

Original file line number	Diff line number	Diff line change
`@@ -14,7 +14,7 @@ namespace System`
`14`	`14`	`{`
`15`	`15`	`[DebuggerDisplay("{DebuggerDisplay,nq}")]`
`16`	`16`	`[DebuggerTypeProxy(typeof(MemoryDebugView<>))]`
`17`		`- public struct Memory<T>`
	`17`	`+ public readonly struct Memory<T>`
`18`	`18`	`{`
`19`	`19`	`// NOTE: With the current implementation, Memory<T> and ReadOnlyMemory<T> must have the same layout,`
`20`	`20`	`// as code uses Unsafe.As to cast between them.`