From eba90f544093bdaccfc6393216a45394bea4af9e Mon Sep 17 00:00:00 2001
From: pravic <ehysta@gmail.com>
Date: Fri, 9 Jun 2017 21:59:29 +0300
Subject: [PATCH] Fix ES5 compatibility.

---
 src/theme/book.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/theme/book.js b/src/theme/book.js
index 206bd522..6261895d 100644
--- a/src/theme/book.js
+++ b/src/theme/book.js
@@ -234,9 +234,9 @@ function run_rust_code(code_block) {
         result_block = code_block.find(".result");
     }
 
-    let text = code_block.find(".language-rust").text();
+    var text = code_block.find(".language-rust").text();
 
-    let params = {
+    var params = {
         version: "stable",
         optimize: "0",
         code: text,