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-rw-r--r--ext/tk/lib/tkextlib/vu/bargraph.rb1
-rw-r--r--ext/tk/lib/tkextlib/vu/charts.rb1
-rw-r--r--ext/tk/lib/tkextlib/vu/dial.rb1
-rw-r--r--ext/tk/lib/tkextlib/vu/pie.rb1
-rw-r--r--ext/tk/lib/tkextlib/vu/setup.rb1
-rw-r--r--ext/tk/lib/tkextlib/vu/spinbox.rb1
6 files changed, 6 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/vu/bargraph.rb b/ext/tk/lib/tkextlib/vu/bargraph.rb
index b9fcf925f3..e1d58e9555 100644
--- a/ext/tk/lib/tkextlib/vu/bargraph.rb
+++ b/ext/tk/lib/tkextlib/vu/bargraph.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# ::vu::bargraph widget
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/vu/charts.rb b/ext/tk/lib/tkextlib/vu/charts.rb
index 8569ac5541..66d5cfd394 100644
--- a/ext/tk/lib/tkextlib/vu/charts.rb
+++ b/ext/tk/lib/tkextlib/vu/charts.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# charts -- Create and manipulate canvas Add-On Items
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/vu/dial.rb b/ext/tk/lib/tkextlib/vu/dial.rb
index 4d04974a55..7eb5650df0 100644
--- a/ext/tk/lib/tkextlib/vu/dial.rb
+++ b/ext/tk/lib/tkextlib/vu/dial.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# ::vu::dial widget
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/vu/pie.rb b/ext/tk/lib/tkextlib/vu/pie.rb
index 6b0c485d8a..fb9920cc68 100644
--- a/ext/tk/lib/tkextlib/vu/pie.rb
+++ b/ext/tk/lib/tkextlib/vu/pie.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# ::vu::pie widget
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/vu/setup.rb b/ext/tk/lib/tkextlib/vu/setup.rb
index ee406c6ca0..cc967dced6 100644
--- a/ext/tk/lib/tkextlib/vu/setup.rb
+++ b/ext/tk/lib/tkextlib/vu/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/vu/spinbox.rb b/ext/tk/lib/tkextlib/vu/spinbox.rb
index 7d6104f4d1..082ebd1f62 100644
--- a/ext/tk/lib/tkextlib/vu/spinbox.rb
+++ b/ext/tk/lib/tkextlib/vu/spinbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# ::vu::spinbox widget
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)