From fae33352721c4b4d6fbdc66520043ae721121d77 Mon Sep 17 00:00:00 2001
From: Alex Burka <durka42+github@gmail.com>
Date: Mon, 13 Jun 2016 21:10:12 -0400
Subject: [PATCH] extern fns require named parameters

Not sure the example is going to stay, but I can try to pass Travis for the bragging rights.
---
 src/doc/book/ffi.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/doc/book/ffi.md b/src/doc/book/ffi.md
index 4a55db38d38..74c99273fa2 100644
--- a/src/doc/book/ffi.md
+++ b/src/doc/book/ffi.md
@@ -600,7 +600,7 @@ use std::os::raw::c_int;
 
 extern "C" {
     /// Register the callback.
-    fn register(Option<extern "C" fn(Option<extern "C" fn(c_int) -> c_int>, c_int) -> c_int>);
+    fn register(cb: Option<extern "C" fn(Option<extern "C" fn(c_int) -> c_int>, c_int) -> c_int>);
 }
 
 /// This fairly useless function receives a function pointer and an integer