From 98b2fa5104f4203949e16067afdaf6203b17e180 Mon Sep 17 00:00:00 2001
From: Martin Grenfell <martin.grenfell@gmail.com>
Date: Wed, 4 Jan 2012 09:27:06 +0000
Subject: [PATCH] make a syntax fix for certain versions of vim

It seems that some versions of vim done like the syntax of:
    function("foo")()

so refactor it slightly.
---
 plugin/NERD_tree.vim | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/plugin/NERD_tree.vim b/plugin/NERD_tree.vim
index 9b8d70a..d215880 100644
--- a/plugin/NERD_tree.vim
+++ b/plugin/NERD_tree.vim
@@ -521,10 +521,11 @@ endfunction
 "FUNCTION: KeyMap.invoke() {{{3
 "Call the KeyMaps callback function
 function! s:KeyMap.invoke(...)
+    let Callback = function(self.callback)
     if a:0
-        call function(self.callback)(a:1)
+        call Callback(a:1)
     else
-        call function(self.callback)()
+        call Callback()
     endif
 endfunction