From debdb998168536d6dbcb9b385c96673366dee425 Mon Sep 17 00:00:00 2001
From: Saul Rennison <saul.rennison@gmail.com>
Date: Thu, 9 Mar 2017 22:32:57 +0000
Subject: [PATCH] Use the IEnumerable String.Join overload that was added in
 .Net Framework 4.0

---
 src/fsharp/FSharp.Core/string.fs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/fsharp/FSharp.Core/string.fs b/src/fsharp/FSharp.Core/string.fs
index 18ead1299c0..e28df925efd 100644
--- a/src/fsharp/FSharp.Core/string.fs
+++ b/src/fsharp/FSharp.Core/string.fs
@@ -20,7 +20,7 @@ namespace Microsoft.FSharp.Core
 
         [<CompiledName("Concat")>]
         let concat sep (strings : seq<string>) =  
-            String.Join(sep, Seq.toArray strings)
+            String.Join(sep, strings)
 
         [<CompiledName("Iterate")>]
         let iter (f : (char -> unit)) (str:string) =