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-rw-r--r--ext/tk/lib/tkextlib/iwidgets/buttonbox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/calendar.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/canvasprintbox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/canvasprintdialog.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/checkbox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/combobox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/dateentry.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/datefield.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/dialog.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/dialogshell.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/disjointlistbox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/entryfield.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/extbutton.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/extfileselectionbox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/extfileselectiondialog.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/feedback.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/fileselectionbox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/fileselectiondialog.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/finddialog.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/hierarchy.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/hyperhelp.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/labeledframe.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/labeledwidget.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/mainwindow.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/menubar.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/messagebox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/messagedialog.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/notebook.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/optionmenu.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/panedwindow.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/promptdialog.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/pushbutton.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/radiobox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/scopedobject.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/scrolledframe.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/scrolledhtml.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/scrolledtext.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/scrolledwidget.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/selectionbox.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/selectiondialog.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/setup.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/shell.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/spindate.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/spinint.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/spinner.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/spintime.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/tabnotebook.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/tabset.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/timeentry.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/timefield.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/toolbar.rb1
-rw-r--r--ext/tk/lib/tkextlib/iwidgets/watch.rb1
54 files changed, 54 insertions, 0 deletions
diff --git a/ext/tk/lib/tkextlib/iwidgets/buttonbox.rb b/ext/tk/lib/tkextlib/iwidgets/buttonbox.rb
index 91e06d1b52..0357114c83 100644
--- a/ext/tk/lib/tkextlib/iwidgets/buttonbox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/buttonbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/buttonbox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/calendar.rb b/ext/tk/lib/tkextlib/iwidgets/calendar.rb
index a5478c7cc6..4cfb9203c8 100644
--- a/ext/tk/lib/tkextlib/iwidgets/calendar.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/calendar.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/calendar.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/canvasprintbox.rb b/ext/tk/lib/tkextlib/iwidgets/canvasprintbox.rb
index 398eec3f1a..3fe489dc95 100644
--- a/ext/tk/lib/tkextlib/iwidgets/canvasprintbox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/canvasprintbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/canvasprintbox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/canvasprintdialog.rb b/ext/tk/lib/tkextlib/iwidgets/canvasprintdialog.rb
index e64d8154ca..4b5fdf5d7c 100644
--- a/ext/tk/lib/tkextlib/iwidgets/canvasprintdialog.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/canvasprintdialog.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/canvasprintdialog.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/checkbox.rb b/ext/tk/lib/tkextlib/iwidgets/checkbox.rb
index a7476c824e..4589fe7ffa 100644
--- a/ext/tk/lib/tkextlib/iwidgets/checkbox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/checkbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/checkbox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/combobox.rb b/ext/tk/lib/tkextlib/iwidgets/combobox.rb
index 82dcf25d0b..d4c05b5be5 100644
--- a/ext/tk/lib/tkextlib/iwidgets/combobox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/combobox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/combobox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/dateentry.rb b/ext/tk/lib/tkextlib/iwidgets/dateentry.rb
index 98a0051e55..e135b89ed7 100644
--- a/ext/tk/lib/tkextlib/iwidgets/dateentry.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/dateentry.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/dateentry.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/datefield.rb b/ext/tk/lib/tkextlib/iwidgets/datefield.rb
index 50d5405a3b..35977e1f6d 100644
--- a/ext/tk/lib/tkextlib/iwidgets/datefield.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/datefield.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/datefield.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/dialog.rb b/ext/tk/lib/tkextlib/iwidgets/dialog.rb
index 2d554ca7b5..edefba1844 100644
--- a/ext/tk/lib/tkextlib/iwidgets/dialog.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/dialog.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/dialog.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/dialogshell.rb b/ext/tk/lib/tkextlib/iwidgets/dialogshell.rb
index e880594532..009fc61c56 100644
--- a/ext/tk/lib/tkextlib/iwidgets/dialogshell.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/dialogshell.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/dialogshell.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/disjointlistbox.rb b/ext/tk/lib/tkextlib/iwidgets/disjointlistbox.rb
index 07ab025cdf..3ae3f319b6 100644
--- a/ext/tk/lib/tkextlib/iwidgets/disjointlistbox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/disjointlistbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/disjointlistbox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/entryfield.rb b/ext/tk/lib/tkextlib/iwidgets/entryfield.rb
index 3e7149a662..75baca05d4 100644
--- a/ext/tk/lib/tkextlib/iwidgets/entryfield.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/entryfield.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/entryfield.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/extbutton.rb b/ext/tk/lib/tkextlib/iwidgets/extbutton.rb
index e744fba91a..3c77c2ec21 100644
--- a/ext/tk/lib/tkextlib/iwidgets/extbutton.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/extbutton.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/extbutton.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/extfileselectionbox.rb b/ext/tk/lib/tkextlib/iwidgets/extfileselectionbox.rb
index 2ff15bb509..4581771309 100644
--- a/ext/tk/lib/tkextlib/iwidgets/extfileselectionbox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/extfileselectionbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/extfileselectionbox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/extfileselectiondialog.rb b/ext/tk/lib/tkextlib/iwidgets/extfileselectiondialog.rb
index 509fdcf636..32a06cc46f 100644
--- a/ext/tk/lib/tkextlib/iwidgets/extfileselectiondialog.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/extfileselectiondialog.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/extfileselectiondialog.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/feedback.rb b/ext/tk/lib/tkextlib/iwidgets/feedback.rb
index 29d04c8a5d..e52d60edac 100644
--- a/ext/tk/lib/tkextlib/iwidgets/feedback.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/feedback.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/feedback.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/fileselectionbox.rb b/ext/tk/lib/tkextlib/iwidgets/fileselectionbox.rb
index a425b53b5f..3811f2b57e 100644
--- a/ext/tk/lib/tkextlib/iwidgets/fileselectionbox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/fileselectionbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/fileselectionbox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/fileselectiondialog.rb b/ext/tk/lib/tkextlib/iwidgets/fileselectiondialog.rb
index ebcdaf8c0b..8d368486ea 100644
--- a/ext/tk/lib/tkextlib/iwidgets/fileselectiondialog.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/fileselectiondialog.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/fileselectiondialog.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/finddialog.rb b/ext/tk/lib/tkextlib/iwidgets/finddialog.rb
index 3d522e07c8..ff0b587390 100644
--- a/ext/tk/lib/tkextlib/iwidgets/finddialog.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/finddialog.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/finddialog.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/hierarchy.rb b/ext/tk/lib/tkextlib/iwidgets/hierarchy.rb
index cb9301d0c9..af99973240 100644
--- a/ext/tk/lib/tkextlib/iwidgets/hierarchy.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/hierarchy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/hierarchy.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/hyperhelp.rb b/ext/tk/lib/tkextlib/iwidgets/hyperhelp.rb
index d4ea1aac65..1650c7af37 100644
--- a/ext/tk/lib/tkextlib/iwidgets/hyperhelp.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/hyperhelp.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/hyperhelp.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/labeledframe.rb b/ext/tk/lib/tkextlib/iwidgets/labeledframe.rb
index 6595398427..f4f3786528 100644
--- a/ext/tk/lib/tkextlib/iwidgets/labeledframe.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/labeledframe.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/labeledframe.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/labeledwidget.rb b/ext/tk/lib/tkextlib/iwidgets/labeledwidget.rb
index d36d42878d..fe3c03135c 100644
--- a/ext/tk/lib/tkextlib/iwidgets/labeledwidget.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/labeledwidget.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/labeledwidget.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/mainwindow.rb b/ext/tk/lib/tkextlib/iwidgets/mainwindow.rb
index ebf48021db..34c9eb52e3 100644
--- a/ext/tk/lib/tkextlib/iwidgets/mainwindow.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/mainwindow.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/mainwindow.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/menubar.rb b/ext/tk/lib/tkextlib/iwidgets/menubar.rb
index f9a17d0b55..f729511230 100644
--- a/ext/tk/lib/tkextlib/iwidgets/menubar.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/menubar.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/menubar.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/messagebox.rb b/ext/tk/lib/tkextlib/iwidgets/messagebox.rb
index 6adb53d941..a4c28228ee 100644
--- a/ext/tk/lib/tkextlib/iwidgets/messagebox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/messagebox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/messagebox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/messagedialog.rb b/ext/tk/lib/tkextlib/iwidgets/messagedialog.rb
index 9aa590056f..2fb4533b67 100644
--- a/ext/tk/lib/tkextlib/iwidgets/messagedialog.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/messagedialog.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/messagedialog.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/notebook.rb b/ext/tk/lib/tkextlib/iwidgets/notebook.rb
index 7ed4126a4d..ad2a372512 100644
--- a/ext/tk/lib/tkextlib/iwidgets/notebook.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/notebook.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/notebook.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/optionmenu.rb b/ext/tk/lib/tkextlib/iwidgets/optionmenu.rb
index 57a3cc7d2b..642db11ff1 100644
--- a/ext/tk/lib/tkextlib/iwidgets/optionmenu.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/optionmenu.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/optionmenu.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/panedwindow.rb b/ext/tk/lib/tkextlib/iwidgets/panedwindow.rb
index 65463cc85a..5f17bdd862 100644
--- a/ext/tk/lib/tkextlib/iwidgets/panedwindow.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/panedwindow.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/panedwindow.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/promptdialog.rb b/ext/tk/lib/tkextlib/iwidgets/promptdialog.rb
index 7c7ff7ad62..fc73a51742 100644
--- a/ext/tk/lib/tkextlib/iwidgets/promptdialog.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/promptdialog.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/promptdialog.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/pushbutton.rb b/ext/tk/lib/tkextlib/iwidgets/pushbutton.rb
index ae56788289..cec3563ddc 100644
--- a/ext/tk/lib/tkextlib/iwidgets/pushbutton.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/pushbutton.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/pushbutton.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/radiobox.rb b/ext/tk/lib/tkextlib/iwidgets/radiobox.rb
index 21181777b5..1c9e9f8d34 100644
--- a/ext/tk/lib/tkextlib/iwidgets/radiobox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/radiobox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/radiobox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/scopedobject.rb b/ext/tk/lib/tkextlib/iwidgets/scopedobject.rb
index 056cd85322..e17fee98dc 100644
--- a/ext/tk/lib/tkextlib/iwidgets/scopedobject.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/scopedobject.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/buttonbox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb b/ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb
index 4dea2f2d5c..463689f513 100644
--- a/ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/scrolledcanvas.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/scrolledcanvas.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/scrolledframe.rb b/ext/tk/lib/tkextlib/iwidgets/scrolledframe.rb
index 7b7b95df1c..f105576fd6 100644
--- a/ext/tk/lib/tkextlib/iwidgets/scrolledframe.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/scrolledframe.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/scrolledframe.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/scrolledhtml.rb b/ext/tk/lib/tkextlib/iwidgets/scrolledhtml.rb
index dc2966bd48..4ee5abe9fc 100644
--- a/ext/tk/lib/tkextlib/iwidgets/scrolledhtml.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/scrolledhtml.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/scrolledhtml.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb b/ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb
index 20a4cd1d36..94949c5524 100644
--- a/ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/scrolledlistbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/scrolledlistbox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/scrolledtext.rb b/ext/tk/lib/tkextlib/iwidgets/scrolledtext.rb
index 69b7d314fd..1e2898988c 100644
--- a/ext/tk/lib/tkextlib/iwidgets/scrolledtext.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/scrolledtext.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/scrolledtext.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/scrolledwidget.rb b/ext/tk/lib/tkextlib/iwidgets/scrolledwidget.rb
index 5ecd2d72d2..a8b4e5a27b 100644
--- a/ext/tk/lib/tkextlib/iwidgets/scrolledwidget.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/scrolledwidget.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/scrolledwidget.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/selectionbox.rb b/ext/tk/lib/tkextlib/iwidgets/selectionbox.rb
index eb8fe3ad52..333f68e306 100644
--- a/ext/tk/lib/tkextlib/iwidgets/selectionbox.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/selectionbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/selectionbox.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/selectiondialog.rb b/ext/tk/lib/tkextlib/iwidgets/selectiondialog.rb
index 45aecf3266..0d0b94e8d2 100644
--- a/ext/tk/lib/tkextlib/iwidgets/selectiondialog.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/selectiondialog.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/selectiondialog.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/setup.rb b/ext/tk/lib/tkextlib/iwidgets/setup.rb
index ee406c6ca0..cc967dced6 100644
--- a/ext/tk/lib/tkextlib/iwidgets/setup.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/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/iwidgets/shell.rb b/ext/tk/lib/tkextlib/iwidgets/shell.rb
index c560e3ac29..f09e7d4d31 100644
--- a/ext/tk/lib/tkextlib/iwidgets/shell.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/shell.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/shell.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/spindate.rb b/ext/tk/lib/tkextlib/iwidgets/spindate.rb
index b3de9ed989..8860348cc0 100644
--- a/ext/tk/lib/tkextlib/iwidgets/spindate.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/spindate.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/spindate.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/spinint.rb b/ext/tk/lib/tkextlib/iwidgets/spinint.rb
index bede3bb1bf..85736d095c 100644
--- a/ext/tk/lib/tkextlib/iwidgets/spinint.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/spinint.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/spinint.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/spinner.rb b/ext/tk/lib/tkextlib/iwidgets/spinner.rb
index d960996e22..49968e86d8 100644
--- a/ext/tk/lib/tkextlib/iwidgets/spinner.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/spinner.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/spinner.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/spintime.rb b/ext/tk/lib/tkextlib/iwidgets/spintime.rb
index 20f8197a09..9b280ec0e4 100644
--- a/ext/tk/lib/tkextlib/iwidgets/spintime.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/spintime.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/spintime.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/tabnotebook.rb b/ext/tk/lib/tkextlib/iwidgets/tabnotebook.rb
index f56efa9aaf..89e3362185 100644
--- a/ext/tk/lib/tkextlib/iwidgets/tabnotebook.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/tabnotebook.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/tabnotebook.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/tabset.rb b/ext/tk/lib/tkextlib/iwidgets/tabset.rb
index 501ead4964..816ea087ef 100644
--- a/ext/tk/lib/tkextlib/iwidgets/tabset.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/tabset.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/tabset.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/timeentry.rb b/ext/tk/lib/tkextlib/iwidgets/timeentry.rb
index b0afb3afd9..d4078e6e4f 100644
--- a/ext/tk/lib/tkextlib/iwidgets/timeentry.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/timeentry.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/timeentry.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/timefield.rb b/ext/tk/lib/tkextlib/iwidgets/timefield.rb
index c34281d4ff..d759a0762f 100644
--- a/ext/tk/lib/tkextlib/iwidgets/timefield.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/timefield.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/timefield.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/toolbar.rb b/ext/tk/lib/tkextlib/iwidgets/toolbar.rb
index 5b474c3816..7f2a54b88b 100644
--- a/ext/tk/lib/tkextlib/iwidgets/toolbar.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/toolbar.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/toolbar.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tkextlib/iwidgets/watch.rb b/ext/tk/lib/tkextlib/iwidgets/watch.rb
index f10ec54cb2..c6e862b36a 100644
--- a/ext/tk/lib/tkextlib/iwidgets/watch.rb
+++ b/ext/tk/lib/tkextlib/iwidgets/watch.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkextlib/iwidgets/watch.rb
# by Hidetoshi NAGAI (nagai@ai.kyutech.ac.jp)