Enable async feature/tests

Author: VSadov

src/coreclr/inc/clrconfigvalues.h

@@ -714,7 +714,7 @@ 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.targets

@@ -4,10 +4,5 @@
     <DisableProjectBuild Condition="'$(RuntimeFlavor)' == 'mono' or '$(TestBuildMode)' == 'nativeaot' or '$(TargetArchitecture)' == 'wasm'">true</DisableProjectBuild>
   </PropertyGroup>
 
-  <PropertyGroup>
-    <!-- runtime async testing in main repo NYI -->
-    <DisableProjectBuild>true</DisableProjectBuild>
-  </PropertyGroup>
-
   <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.targets, $(MSBuildThisFileDirectory)..))" />
 </Project>

src/tests/async/struct/struct.cs

@@ -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()
         {
             AssertEqual(100, this.Value);
@@ -56,6 +58,8 @@ 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()
         {
             AssertEqual(101, this.Value);