From bb53d6c380df702b4e85130aa584b64101113502 Mon Sep 17 00:00:00 2001
From: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Date: Fri, 19 Jul 2019 17:58:30 +0900
Subject: [PATCH] Check function exists

---
 autoload/go/util.vim | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/autoload/go/util.vim b/autoload/go/util.vim
index 2ed41af3e0..ec4ea0ebb1 100644
--- a/autoload/go/util.vim
+++ b/autoload/go/util.vim
@@ -93,7 +93,7 @@ function! go#util#env(key) abort
     return s:env_cache[l:key]
   endif
 
-  if executable('go')
+  if executable('go') && exists('*go#util#'.l:key)
     let l:var = call('go#util#'.l:key, [])
     if go#util#ShellError() != 0
       call go#util#EchoError(printf("'go env %s' failed", toupper(l:key)))