From 46dc1202709142c4778a6da4bbf34d76e6fd4bdc Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 12 Jul 2012 11:53:02 -0400
Subject: [PATCH] Fix the "path" option type

Comparing a string with a context with "/" doesn't work because the
"==" operator also compares context.  So the context needs to be
discarded.
---
 pkgs/lib/types.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/lib/types.nix b/pkgs/lib/types.nix
index 2c85ee0077a4..956368138aa2 100644
--- a/pkgs/lib/types.nix
+++ b/pkgs/lib/types.nix
@@ -89,7 +89,7 @@ rec {
     path = mkOptionType {
       name = "path";
       # Hacky: there is no ‘isPath’ primop.
-      check = lib.traceValIfNot (x: builtins.substring 0 1 (toString x) == "/");
+      check = lib.traceValIfNot (x: builtins.unsafeDiscardStringContext (builtins.substring 0 1 (toString x)) == "/");
     };
 
     listOf = types.list;