Add runtime detection for CovariantReturnsOfClasses (dotnet#37315)

Was missed in dotnet#37276.
wlsoftware · Jun 4, 2020 · 4c23c57 · 4c23c57
1 parent 4a4e347
commit 4c23c57
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Showing 2 changed files with 21 additions and 0 deletions.
diff --git a/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeFeature.cs b/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeFeature.cs
@@ -31,6 +31,7 @@ public static bool IsSupported(string feature)
             switch (feature)
             {
                 case PortablePdb:
+                case CovariantReturnsOfClasses:
 #if FEATURE_DEFAULT_INTERFACES
                 case DefaultImplementationsOfInterfaces:
 #endif

diff --git a/src/libraries/System.Runtime/tests/System/Runtime/CompilerServices/RuntimeFeatureTests.cs b/src/libraries/System.Runtime/tests/System/Runtime/CompilerServices/RuntimeFeatureTests.cs
@@ -3,6 +3,8 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
+using System.Collections.Generic;
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using Xunit;
 
@@ -35,5 +37,23 @@ public static void DynamicCode_Jit()
             Assert.True(RuntimeFeature.IsDynamicCodeSupported);
             Assert.True(RuntimeFeature.IsDynamicCodeCompiled);
         }
+
+        public static IEnumerable<object[]> GetStaticFeatureNames()
+        {
+            foreach (var field in typeof(RuntimeFeature).GetFields(BindingFlags.Public | BindingFlags.Static))
+            {
+                if (!field.IsLiteral)
+                    continue;
+
+                yield return new object[] { field.Name };
+            }
+        }
+
+        [Theory]
+        [MemberData(nameof(GetStaticFeatureNames))]
+        public static void StaticDataMatchesDynamicProbing(string probedValue)
+        {
+            Assert.True(RuntimeFeature.IsSupported(probedValue));
+        }
     }
 }