From f90df170e327ef49c2d2c8c18eda8cda995075f1 Mon Sep 17 00:00:00 2001
From: Andreas Rumpf <rumpf_a@web.de>
Date: Wed, 1 Nov 2017 11:53:09 +0100
Subject: [PATCH] system.nim improvement: make 'len' work with heterogenous
 slices

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

diff --git a/lib/system.nim b/lib/system.nim
index 2bc10035af..51db2ef662 100644
--- a/lib/system.nim
+++ b/lib/system.nim
@@ -2089,7 +2089,7 @@ proc clamp*[T](x, a, b: T): T =
   if x > b: return b
   return x
 
-proc len*[T: Ordinal](x: HSlice[T, T]): int {.noSideEffect, inline.} =
+proc len*[U: Ordinal; V: Ordinal](x: HSlice[U, V]): int {.noSideEffect, inline.} =
   ## length of ordinal slice, when x.b < x.a returns zero length
   ##
   ## .. code-block:: Nim