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-rw-r--r--lib/rubygems/psych_tree.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rubygems/psych_tree.rb b/lib/rubygems/psych_tree.rb
index e3f1d1a08a..a5d306d769 100644
--- a/lib/rubygems/psych_tree.rb
+++ b/lib/rubygems/psych_tree.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
module Gem
if defined? ::Psych::Visitors
class NoAliasYAMLTree < Psych::Visitors::YAMLTree