Add AsyncIteratorStateMachineAttribute

Exactly follows the design of AsyncStateMachineAttribute and IteratorStateMachineAttribute; the only thing different is the type name, "AsyncIterator" instead of "Async" and "Iterator".

diff --git a/src/System.Private.CoreLib/shared/System.Private.CoreLib.Shared.projitems b/src/System.Private.CoreLib/shared/System.Private.CoreLib.Shared.projitems
index 45d6e48..270e2fd 100644 (file)
--- a/src/System.Private.CoreLib/shared/System.Private.CoreLib.Shared.projitems
+++ b/src/System.Private.CoreLib/shared/System.Private.CoreLib.Shared.projitems
@@ -481,6 +481,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)System\Resources\UltimateResourceFallbackLocation.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\AccessedThroughPropertyAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\AsyncIteratorMethodBuilder.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\AsyncIteratorStateMachineAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\AsyncMethodBuilderAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\AsyncStateMachineAttribute.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Runtime\CompilerServices\AsyncValueTaskMethodBuilder.cs" />

diff --git a/src/System.Private.CoreLib/shared/System/Runtime/CompilerServices/AsyncIteratorStateMachineAttribute.cs b/src/System.Private.CoreLib/shared/System/Runtime/CompilerServices/AsyncIteratorStateMachineAttribute.cs
new file mode 100644 (file)
index 0000000..c93156b
--- /dev/null
+++ b/src/System.Private.CoreLib/shared/System/Runtime/CompilerServices/AsyncIteratorStateMachineAttribute.cs
@@ -0,0 +1,15 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.Runtime.CompilerServices
+{
+    [AttributeUsage(AttributeTargets.Method, Inherited = false, AllowMultiple = false)]
+    public sealed class AsyncIteratorStateMachineAttribute : StateMachineAttribute
+    {
+        public AsyncIteratorStateMachineAttribute(Type stateMachineType)
+            : base(stateMachineType)
+        {
+        }
+    }
+}