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-rw-r--r--lib/rexml/formatters/default.rb1
-rw-r--r--lib/rexml/formatters/pretty.rb1
-rw-r--r--lib/rexml/formatters/transitive.rb1
3 files changed, 3 insertions, 0 deletions
diff --git a/lib/rexml/formatters/default.rb b/lib/rexml/formatters/default.rb
index 574c821f96..b84759d2ff 100644
--- a/lib/rexml/formatters/default.rb
+++ b/lib/rexml/formatters/default.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
module REXML
module Formatters
class Default
diff --git a/lib/rexml/formatters/pretty.rb b/lib/rexml/formatters/pretty.rb
index e5ba561a58..a80274bdad 100644
--- a/lib/rexml/formatters/pretty.rb
+++ b/lib/rexml/formatters/pretty.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'rexml/formatters/default'
module REXML
diff --git a/lib/rexml/formatters/transitive.rb b/lib/rexml/formatters/transitive.rb
index 6cc690d922..81e67f3274 100644
--- a/lib/rexml/formatters/transitive.rb
+++ b/lib/rexml/formatters/transitive.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'rexml/formatters/pretty'
module REXML