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-rw-r--r--ext/psych/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/psych/extconf.rb b/ext/psych/extconf.rb
index 65e83a3554..be33d35a5e 100644
--- a/ext/psych/extconf.rb
+++ b/ext/psych/extconf.rb
@@ -1,4 +1,5 @@
# -*- coding: us-ascii -*-
+# frozen_string_literal: false
require 'mkmf'
require 'fileutils'