Fixed Issue #225/b

Author: gsscoder

src/CommandLine/ErrorExtensions.cs

@@ -3,6 +3,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using CommandLine.Core;
+using CommandLine.Infrastructure;
 
 namespace CommandLine
 {
@@ -17,7 +18,10 @@ public static ParserResult<T> ToParserResult<T>(this IEnumerable<Error> errors,
 
         public static IEnumerable<Error> OnlyMeaningfulOnes(this IEnumerable<Error> errors)
         {
-            return errors.Where(e => !e.StopsProcessing);
+            return errors
+                .Where(e => !e.StopsProcessing)
+                .Where(e => !(e.Tag == ErrorType.UnknownOptionError
+                    && ((UnknownOptionError)e).Token.EqualsOrdinalIgnoreCase("help")));
         }
     }
 }

src/CommandLine/Infrastructure/StringExtensions.cs

@@ -43,6 +43,11 @@ public static bool EqualsOrdinal(this string strA, string strB)
             return string.CompareOrdinal(strA, strB) == 0;
         }
 
+        public static bool EqualsOrdinalIgnoreCase(this string strA, string strB)
+        {
+            return string.Compare(strA, strB, StringComparison.OrdinalIgnoreCase) == 0;
+        }
+
         public static int SafeLength(this string value)
         {
             return value == null ? 0 : value.Length;