Enable async feature/tests

Author: VSadov

src/coreclr/inc/clrconfigvalues.h

@@ -720,7 +720,7 @@ RETAIL_CONFIG_DWORD_INFO(EXTERNAL_EnableRiscV64Zbb,             W("EnableRiscV64
 #endif
 
 // Runtime-async
-RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_RuntimeAsync, W("RuntimeAsync"), 0, "Enables runtime async method support")
+RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_RuntimeAsync, W("RuntimeAsync"), 1, "Enables runtime async method support")
 
 ///
 /// Uncategorized

src/tests/async/Directory.Build.props

@@ -5,7 +5,7 @@
 
   <PropertyGroup>
     <RunAnalyzers>true</RunAnalyzers>
-    <NoWarn>$(NoWarn);xUnit1013;CS1998</NoWarn>
+    <NoWarn>$(NoWarn);xUnit1013;CS1998;SYSLIB5007</NoWarn>
     <EnableNETAnalyzers>false</EnableNETAnalyzers>
     <Features>$(Features);runtime-async=on</Features>
   </PropertyGroup>

src/tests/async/Directory.Build.targets

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <Optimize>True</Optimize>
   </PropertyGroup>

src/tests/async/small/small.csproj

@@ -45,6 +45,8 @@ private struct S
 
         public S(int value) => Value = value;
 
+        // Roslyn NYI - async in structs. Remove opt-out once supported.
+        [System.Runtime.CompilerServices.RuntimeAsyncMethodGeneration(false)]
         public async Task Test()
         {
             // TODO: C# compiler is expected to do this, but not in the prototype.
@@ -59,6 +61,8 @@ public async Task Test()
             AssertEqual(102, @this.Value);
         }
 
+        // Roslyn NYI - async in structs. Remove opt-out once supported.
+        [System.Runtime.CompilerServices.RuntimeAsyncMethodGeneration(false)]
         private async Task InstanceCall()
         {
             // TODO: C# compiler is expected to do this, but not in the prototype.