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-rw-r--r--ext/psych/lib/psych/json/tree_builder.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/psych/lib/psych/json/tree_builder.rb b/ext/psych/lib/psych/json/tree_builder.rb
index b799c93f..2f94b8c 100644
--- a/ext/psych/lib/psych/json/tree_builder.rb
+++ b/ext/psych/lib/psych/json/tree_builder.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'psych/json/yaml_events'
module Psych