From b9174c366fe83b3ceaa9e0490b848ae52de1c07d Mon Sep 17 00:00:00 2001
From: Junegunn Choi <junegunn.c@gmail.com>
Date: Sat, 18 Jan 2014 15:06:06 +0900
Subject: [PATCH] Display error message if plug#end is called before plug#begin

---
 plug.vim | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/plug.vim b/plug.vim
index 7564694..8903e30 100644
--- a/plug.vim
+++ b/plug.vim
@@ -91,6 +91,10 @@ function! plug#begin(...)
 endfunction
 
 function! plug#end()
+  if !exists('g:plugs')
+    echoerr 'Call plug#begin() first'
+    return
+  endif
   let keys = keys(g:plugs)
   while !empty(keys)
     let keys = keys(s:extend(keys))