Add EditorBrowsableState.Never to SupportsWhenTEnum

Author: brianrourkeboll

src/FSharp.Core/prim-types.fs

@@ -393,13 +393,15 @@ namespace Microsoft.FSharp.Core
 
 namespace Microsoft.FSharp.Core.CompilerServices
 
+    open System.ComponentModel
     open Microsoft.FSharp.Core
 
     /// <summary>
     /// A marker type that only compilers that support the <c>when 'T : Enum</c>
     /// library-only static optimization constraint will recognize.
     /// </summary>
     [<Sealed; AbstractClass>]
+    [<EditorBrowsable(EditorBrowsableState.Never)>]
     [<CompilerMessage("This type is for compiler use and should not be used directly", 1204, IsHidden = true)>]
     type SupportsWhenTEnum = class end
 

src/FSharp.Core/prim-types.fsi

@@ -996,13 +996,15 @@ namespace Microsoft.FSharp.Core
 
 namespace Microsoft.FSharp.Core.CompilerServices
 
+    open System.ComponentModel
     open Microsoft.FSharp.Core
 
     /// <summary>
     /// A marker type that only compilers that support the <c>when 'T : Enum</c>
     /// library-only static optimization constraint will recognize.
     /// </summary>
     [<Sealed; AbstractClass>]
+    [<EditorBrowsable(EditorBrowsableState.Never)>]
     [<CompilerMessage("This type is for compiler use and should not be used directly", 1204, IsHidden = true)>]
     type SupportsWhenTEnum = class end