Better exception message.

svn path=/trunk/mcs/; revision=150391

diff --git a/mcs/class/System.Core/System.Linq/Enumerable.cs b/mcs/class/System.Core/System.Linq/Enumerable.cs
index c6d72fe40fc1f3b99a39c85487dd2d18afb2b6d3..2b44f9f420e9bb3d304930668b2a5c63772d7a37 100644 (file)
--- a/mcs/class/System.Core/System.Linq/Enumerable.cs
+++ b/mcs/class/System.Core/System.Linq/Enumerable.cs
@@ -603,8 +603,6 @@ namespace System.Linq
                        if (list != null) {
                                if (list.Count != 0)
                                        return list [0];
-
-                               throw new InvalidOperationException ();
                        } else {
                                using (var enumerator = source.GetEnumerator ()) {
                                        if (enumerator.MoveNext ())
@@ -612,7 +610,7 @@ namespace System.Linq
                                }
                        }
 
-                       throw new InvalidOperationException ();
+                       throw new InvalidOperationException ("The source sequence is empty");
                }
 
                public static TSource First<TSource> (this IEnumerable<TSource> source, Func<TSource, bool> predicate)