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-rw-r--r--lib/redmine/nested_set/issue_nested_set.rb2
-rw-r--r--lib/redmine/nested_set/project_nested_set.rb2
-rw-r--r--lib/redmine/nested_set/traversing.rb2
3 files changed, 6 insertions, 0 deletions
diff --git a/lib/redmine/nested_set/issue_nested_set.rb b/lib/redmine/nested_set/issue_nested_set.rb
index bb921d6de..61469e808 100644
--- a/lib/redmine/nested_set/issue_nested_set.rb
+++ b/lib/redmine/nested_set/issue_nested_set.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: false
+
# Redmine - project management software
# Copyright (C) 2006-2017 Jean-Philippe Lang
#
diff --git a/lib/redmine/nested_set/project_nested_set.rb b/lib/redmine/nested_set/project_nested_set.rb
index d6d33efaf..fa955be06 100644
--- a/lib/redmine/nested_set/project_nested_set.rb
+++ b/lib/redmine/nested_set/project_nested_set.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: false
+
# Redmine - project management software
# Copyright (C) 2006-2017 Jean-Philippe Lang
#
diff --git a/lib/redmine/nested_set/traversing.rb b/lib/redmine/nested_set/traversing.rb
index 07b6deec4..5809ed92a 100644
--- a/lib/redmine/nested_set/traversing.rb
+++ b/lib/redmine/nested_set/traversing.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: false
+
# Redmine - project management software
# Copyright (C) 2006-2017 Jean-Philippe Lang
#