From 5298c509a7b0168f0edce9b28442feca914d15f7 Mon Sep 17 00:00:00 2001
From: Araq <rumpf_a@web.de>
Date: Mon, 1 Oct 2018 12:51:34 +0200
Subject: [PATCH] fixes #9126

---
 lib/pure/os.nim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/pure/os.nim b/lib/pure/os.nim
index 5c7d369c9..b5fc2da3e 100644
--- a/lib/pure/os.nim
+++ b/lib/pure/os.nim
@@ -1048,7 +1048,7 @@ proc copyDir*(source, dest: string) {.rtl, extern: "nos$1",
   ## these platforms use `copyDirWithPermissions() <#copyDirWithPermissions>`_.
   createDir(dest)
   for kind, path in walkDir(source):
-    var noSource = path.substr(source.len()+1)
+    var noSource = path.substr(source.len)
     case kind
     of pcFile:
       copyFile(path, dest / noSource)