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-rw-r--r--ext/tk/lib/tkextlib/tkDND/setup.rb1
-rw-r--r--ext/tk/lib/tkextlib/tkDND/shape.rb1
-rw-r--r--ext/tk/lib/tkextlib/tkDND/tkdnd.rb1
3 files changed, 3 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/tkDND/setup.rb b/ext/tk/lib/tkextlib/tkDND/setup.rb
index ee406c6ca0..cc967dced6 100644
--- a/ext/tk/lib/tkextlib/tkDND/setup.rb
+++ b/ext/tk/lib/tkextlib/tkDND/setup.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# setup.rb -- setup script before calling TkPackage.require()
#
diff --git a/ext/tk/lib/tkextlib/tkDND/shape.rb b/ext/tk/lib/tkextlib/tkDND/shape.rb
index d44068ed33..06d8d64ac7 100644
--- a/ext/tk/lib/tkextlib/tkDND/shape.rb
+++ b/ext/tk/lib/tkextlib/tkDND/shape.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/tkDND/shape.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/tkDND/tkdnd.rb b/ext/tk/lib/tkextlib/tkDND/tkdnd.rb
index 38e05ce775..c2059b7c23 100644
--- a/ext/tk/lib/tkextlib/tkDND/tkdnd.rb
+++ b/ext/tk/lib/tkextlib/tkDND/tkdnd.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/tkDND/tkdnd.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)