From e94b1a91ce85306622f03996792d3665a675d69d Mon Sep 17 00:00:00 2001
From: Kornelius Kalnbach <murphy@rubychan.de>
Date: Fri, 7 Jul 2017 08:39:43 +0200
Subject: ensure that all string literals can be frozen (thanks, @pat)

---
 .travis.yml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index 75a57bb..a486c23 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,6 +16,8 @@ rvm:
 branches:
   only:
     - master
+before_script:
+- if (ruby -e "exit RUBY_VERSION.to_f >= 2.4"); then export RUBYOPT="--enable-frozen-string-literal"; fi; echo $RUBYOPT
 matrix:
   allow_failures:
     - rvm: ruby-head
-- 
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