From 8ab8c815eccf0b18119c56679d584eca07dd6ec4 Mon Sep 17 00:00:00 2001
From: Daniel Shahaf <d.s@daniel.shahaf.name>
Date: Fri, 30 Oct 2015 09:34:16 +0200
Subject: [PATCH] Fix syntax error with zsh-5.0.5-dev-1 and older.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

zsh prior to workers/32609 (commit 9d47e8398d299e53ffe4e7ddf3731d2fedae9948)
does not support the (-n)-less «[[ $var ]]» syntax.

Fixes zsh-users/zsh-syntax-highlighting#225.
---
 highlighters/main/main-highlighter.zsh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/highlighters/main/main-highlighter.zsh b/highlighters/main/main-highlighter.zsh
index db28998..ce48ce7 100644
--- a/highlighters/main/main-highlighter.zsh
+++ b/highlighters/main/main-highlighter.zsh
@@ -194,7 +194,7 @@ _zsh_highlight_main_highlighter()
       ((end_pos=$start_pos+${#arg}))
     fi
 
-    if [[ ${interactive_comments+'set'} && $arg[1] == $histchars[3] ]]; then
+    if [[ -n ${interactive_comments+'set'} && $arg[1] == $histchars[3] ]]; then
       if [[ $this_word == *(':regular:'|':start:')* ]]; then
         style=$ZSH_HIGHLIGHT_STYLES[comment]
       else