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-rw-r--r--lib/arel/visitors/bind_substitute.rb1
-rw-r--r--lib/arel/visitors/depth_first.rb1
-rw-r--r--lib/arel/visitors/reduce.rb1
-rw-r--r--lib/arel/visitors/visitor.rb1
4 files changed, 4 insertions, 0 deletions
diff --git a/lib/arel/visitors/bind_substitute.rb b/lib/arel/visitors/bind_substitute.rb
index ce0fb5c924..52c96b0d72 100644
--- a/lib/arel/visitors/bind_substitute.rb
+++ b/lib/arel/visitors/bind_substitute.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module Arel
module Visitors
class BindSubstitute
diff --git a/lib/arel/visitors/depth_first.rb b/lib/arel/visitors/depth_first.rb
index 69ed345aea..5416a285f5 100644
--- a/lib/arel/visitors/depth_first.rb
+++ b/lib/arel/visitors/depth_first.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module Arel
module Visitors
class DepthFirst < Arel::Visitors::Visitor
diff --git a/lib/arel/visitors/reduce.rb b/lib/arel/visitors/reduce.rb
index 9670cad27c..7948758e2f 100644
--- a/lib/arel/visitors/reduce.rb
+++ b/lib/arel/visitors/reduce.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require 'arel/visitors/visitor'
module Arel
diff --git a/lib/arel/visitors/visitor.rb b/lib/arel/visitors/visitor.rb
index bfe7342f04..b96b8238a7 100644
--- a/lib/arel/visitors/visitor.rb
+++ b/lib/arel/visitors/visitor.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
module Arel
module Visitors
class Visitor