Add Enum.HasFlag (#112)

Author: josesimoes

nanoFramework.CoreLibrary/System/AssemblyInfo.cs

@@ -14,4 +14,4 @@
 [assembly: AssemblyProduct("nanoFramework mscorlib")]
 [assembly: AssemblyCopyright("Copyright (c) .NET Foundation and Contributors")]
 
-[assembly: AssemblyNativeVersion("100.5.0.1")]
+[assembly: AssemblyNativeVersion("100.5.0.2")]

nanoFramework.CoreLibrary/System/Enum.cs

@@ -4,6 +4,8 @@
 // See LICENSE file in the project root for full license information.
 //
 
+using System.Runtime.CompilerServices;
+
 namespace System
 {
     /// <summary>
@@ -12,6 +14,14 @@ namespace System
     [Serializable]
     public abstract class Enum : ValueType
     {
+        /// <summary>
+        /// Determines whether one or more bit fields are set in the current instance.
+        /// </summary>
+        /// <param name="flag">An enumeration value.</param>
+        /// <returns><see langword="true"/> if the bit field or bit fields that are set in flag are also set in the current instance; otherwise, <see langword="false"/>.</returns>
+        /// <exception cref="ArgumentException"><paramref name="flag"/> is a different type than the current instance.</exception>
+        [MethodImpl(MethodImplOptions.InternalCall)]
+        public extern bool HasFlag(Enum flag);
 
         /// <summary>
         /// Converts the value of this instance to its equivalent string representation.

version.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://raw.githubusercontent.com/dotnet/Nerdbank.GitVersioning/master/src/NerdBank.GitVersioning/version.schema.json",
-  "version": "1.9.0-preview.{height}",
+  "version": "1.9.1-preview.{height}",
   "assemblyVersion": {
     "precision": "revision"
   },