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-rw-r--r--ext/psych/lib/psych/visitors/depth_first.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/psych/lib/psych/visitors/depth_first.rb b/ext/psych/lib/psych/visitors/depth_first.rb
index c6eb814..2d74a21 100644
--- a/ext/psych/lib/psych/visitors/depth_first.rb
+++ b/ext/psych/lib/psych/visitors/depth_first.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
module Psych
module Visitors
class DepthFirst < Psych::Visitors::Visitor