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-rw-r--r--ext/tk/lib/tk/after.rb1
-rw-r--r--ext/tk/lib/tk/autoload.rb1
-rw-r--r--ext/tk/lib/tk/bgerror.rb1
-rw-r--r--ext/tk/lib/tk/bindtag.rb1
-rw-r--r--ext/tk/lib/tk/busy.rb1
-rw-r--r--ext/tk/lib/tk/button.rb1
-rw-r--r--ext/tk/lib/tk/canvas.rb1
-rw-r--r--ext/tk/lib/tk/canvastag.rb1
-rw-r--r--ext/tk/lib/tk/checkbutton.rb1
-rw-r--r--ext/tk/lib/tk/clipboard.rb1
-rw-r--r--ext/tk/lib/tk/clock.rb1
-rw-r--r--ext/tk/lib/tk/composite.rb1
-rw-r--r--ext/tk/lib/tk/console.rb1
-rw-r--r--ext/tk/lib/tk/dialog.rb1
-rw-r--r--ext/tk/lib/tk/encodedstr.rb1
-rw-r--r--ext/tk/lib/tk/entry.rb1
-rw-r--r--ext/tk/lib/tk/event.rb1
-rw-r--r--ext/tk/lib/tk/font.rb1
-rw-r--r--ext/tk/lib/tk/fontchooser.rb1
-rw-r--r--ext/tk/lib/tk/frame.rb1
-rw-r--r--ext/tk/lib/tk/grid.rb1
-rw-r--r--ext/tk/lib/tk/image.rb1
-rw-r--r--ext/tk/lib/tk/itemconfig.rb1
-rw-r--r--ext/tk/lib/tk/itemfont.rb1
-rw-r--r--ext/tk/lib/tk/kinput.rb1
-rw-r--r--ext/tk/lib/tk/label.rb1
-rw-r--r--ext/tk/lib/tk/labelframe.rb1
-rw-r--r--ext/tk/lib/tk/listbox.rb1
-rw-r--r--ext/tk/lib/tk/macpkg.rb1
-rw-r--r--ext/tk/lib/tk/menu.rb1
-rw-r--r--ext/tk/lib/tk/menubar.rb1
-rw-r--r--ext/tk/lib/tk/menuspec.rb1
-rw-r--r--ext/tk/lib/tk/message.rb1
-rw-r--r--ext/tk/lib/tk/mngfocus.rb1
-rw-r--r--ext/tk/lib/tk/msgcat.rb1
-rw-r--r--ext/tk/lib/tk/namespace.rb1
-rw-r--r--ext/tk/lib/tk/optiondb.rb1
-rw-r--r--ext/tk/lib/tk/optionobj.rb1
-rw-r--r--ext/tk/lib/tk/pack.rb1
-rw-r--r--ext/tk/lib/tk/package.rb1
-rw-r--r--ext/tk/lib/tk/palette.rb1
-rw-r--r--ext/tk/lib/tk/panedwindow.rb1
-rw-r--r--ext/tk/lib/tk/place.rb1
-rw-r--r--ext/tk/lib/tk/radiobutton.rb1
-rw-r--r--ext/tk/lib/tk/root.rb1
-rw-r--r--ext/tk/lib/tk/scale.rb1
-rw-r--r--ext/tk/lib/tk/scrollable.rb1
-rw-r--r--ext/tk/lib/tk/scrollbar.rb1
-rw-r--r--ext/tk/lib/tk/scrollbox.rb1
-rw-r--r--ext/tk/lib/tk/selection.rb1
-rw-r--r--ext/tk/lib/tk/spinbox.rb1
-rw-r--r--ext/tk/lib/tk/tagfont.rb1
-rw-r--r--ext/tk/lib/tk/text.rb1
-rw-r--r--ext/tk/lib/tk/textimage.rb1
-rw-r--r--ext/tk/lib/tk/textmark.rb1
-rw-r--r--ext/tk/lib/tk/texttag.rb1
-rw-r--r--ext/tk/lib/tk/textwindow.rb1
-rw-r--r--ext/tk/lib/tk/timer.rb1
-rw-r--r--ext/tk/lib/tk/tk_mac.rb1
-rw-r--r--ext/tk/lib/tk/toplevel.rb1
-rw-r--r--ext/tk/lib/tk/ttk_selector.rb1
-rw-r--r--ext/tk/lib/tk/txtwin_abst.rb1
-rw-r--r--ext/tk/lib/tk/validation.rb1
-rw-r--r--ext/tk/lib/tk/variable.rb1
-rw-r--r--ext/tk/lib/tk/virtevent.rb1
-rw-r--r--ext/tk/lib/tk/winfo.rb1
-rw-r--r--ext/tk/lib/tk/winpkg.rb1
-rw-r--r--ext/tk/lib/tk/wm.rb1
-rw-r--r--ext/tk/lib/tk/xim.rb1
69 files changed, 69 insertions, 0 deletions
diff --git a/ext/tk/lib/tk/after.rb b/ext/tk/lib/tk/after.rb
index 8c58210331..3213a6b818 100644
--- a/ext/tk/lib/tk/after.rb
+++ b/ext/tk/lib/tk/after.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/after.rb : methods for Tcl/Tk after command
#
diff --git a/ext/tk/lib/tk/autoload.rb b/ext/tk/lib/tk/autoload.rb
index 451922c7d3..3d19fb053d 100644
--- a/ext/tk/lib/tk/autoload.rb
+++ b/ext/tk/lib/tk/autoload.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# autoload
#
diff --git a/ext/tk/lib/tk/bgerror.rb b/ext/tk/lib/tk/bgerror.rb
index c82a8e046b..9d2f59357e 100644
--- a/ext/tk/lib/tk/bgerror.rb
+++ b/ext/tk/lib/tk/bgerror.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tkbgerror -- bgerror ( tkerror ) module
# 1998/07/16 by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>
diff --git a/ext/tk/lib/tk/bindtag.rb b/ext/tk/lib/tk/bindtag.rb
index 23b4e0b7c3..ad3c90b505 100644
--- a/ext/tk/lib/tk/bindtag.rb
+++ b/ext/tk/lib/tk/bindtag.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/bind.rb : control event binding
#
diff --git a/ext/tk/lib/tk/busy.rb b/ext/tk/lib/tk/busy.rb
index 7f4f89f524..18ebede9dd 100644
--- a/ext/tk/lib/tk/busy.rb
+++ b/ext/tk/lib/tk/busy.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/busy.rb: support 'tk busy' command (Tcl/Tk8.6 or later)
#
diff --git a/ext/tk/lib/tk/button.rb b/ext/tk/lib/tk/button.rb
index 65233c91b6..dc252d8e82 100644
--- a/ext/tk/lib/tk/button.rb
+++ b/ext/tk/lib/tk/button.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/button.rb : treat button widget
#
diff --git a/ext/tk/lib/tk/canvas.rb b/ext/tk/lib/tk/canvas.rb
index f3e9a7c229..d707733d8c 100644
--- a/ext/tk/lib/tk/canvas.rb
+++ b/ext/tk/lib/tk/canvas.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/canvas.rb - Tk canvas classes
# by Yukihiro Matsumoto <matz@caelum.co.jp>
diff --git a/ext/tk/lib/tk/canvastag.rb b/ext/tk/lib/tk/canvastag.rb
index 495d92a9a8..4a14cd78a9 100644
--- a/ext/tk/lib/tk/canvastag.rb
+++ b/ext/tk/lib/tk/canvastag.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/canvastag.rb - methods for treating canvas tags
#
diff --git a/ext/tk/lib/tk/checkbutton.rb b/ext/tk/lib/tk/checkbutton.rb
index b7449541c5..521b015b3e 100644
--- a/ext/tk/lib/tk/checkbutton.rb
+++ b/ext/tk/lib/tk/checkbutton.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/checkbutton.rb : treat checkbutton widget
#
diff --git a/ext/tk/lib/tk/clipboard.rb b/ext/tk/lib/tk/clipboard.rb
index d4205a5c28..c5f481f979 100644
--- a/ext/tk/lib/tk/clipboard.rb
+++ b/ext/tk/lib/tk/clipboard.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/clipboard.rb : methods to treat clipboard
#
diff --git a/ext/tk/lib/tk/clock.rb b/ext/tk/lib/tk/clock.rb
index 4e9438f5ab..df900d7364 100644
--- a/ext/tk/lib/tk/clock.rb
+++ b/ext/tk/lib/tk/clock.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/clock.rb : methods for clock command
#
diff --git a/ext/tk/lib/tk/composite.rb b/ext/tk/lib/tk/composite.rb
index e267c7a22b..830d383d69 100644
--- a/ext/tk/lib/tk/composite.rb
+++ b/ext/tk/lib/tk/composite.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/composite.rb :
#
diff --git a/ext/tk/lib/tk/console.rb b/ext/tk/lib/tk/console.rb
index 64e257594c..c560912da8 100644
--- a/ext/tk/lib/tk/console.rb
+++ b/ext/tk/lib/tk/console.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/console.rb : control the console on system without a real console
#
diff --git a/ext/tk/lib/tk/dialog.rb b/ext/tk/lib/tk/dialog.rb
index 7ef7820699..0b19be7cfa 100644
--- a/ext/tk/lib/tk/dialog.rb
+++ b/ext/tk/lib/tk/dialog.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/dialog.rb : create dialog boxes
#
diff --git a/ext/tk/lib/tk/encodedstr.rb b/ext/tk/lib/tk/encodedstr.rb
index 59fbb1911d..9ca13b3d1a 100644
--- a/ext/tk/lib/tk/encodedstr.rb
+++ b/ext/tk/lib/tk/encodedstr.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/encodedstr.rb : Tk::EncodedString class
#
diff --git a/ext/tk/lib/tk/entry.rb b/ext/tk/lib/tk/entry.rb
index d4aa03f2b6..aa40e4755c 100644
--- a/ext/tk/lib/tk/entry.rb
+++ b/ext/tk/lib/tk/entry.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/entry.rb - Tk entry classes
# by Yukihiro Matsumoto <matz@caelum.co.jp>
diff --git a/ext/tk/lib/tk/event.rb b/ext/tk/lib/tk/event.rb
index bf4e122322..5658e92874 100644
--- a/ext/tk/lib/tk/event.rb
+++ b/ext/tk/lib/tk/event.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/event.rb - module for event
#
diff --git a/ext/tk/lib/tk/font.rb b/ext/tk/lib/tk/font.rb
index 03db850f96..7a2a549849 100644
--- a/ext/tk/lib/tk/font.rb
+++ b/ext/tk/lib/tk/font.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/font.rb - the class to treat fonts on Ruby/Tk
#
diff --git a/ext/tk/lib/tk/fontchooser.rb b/ext/tk/lib/tk/fontchooser.rb
index 6dab0c6cf9..325ca4dbd2 100644
--- a/ext/tk/lib/tk/fontchooser.rb
+++ b/ext/tk/lib/tk/fontchooser.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/fontchooser.rb -- "tk fontchooser" support (Tcl/Tk8.6 or later)
#
diff --git a/ext/tk/lib/tk/frame.rb b/ext/tk/lib/tk/frame.rb
index 5118939732..0682faf3fe 100644
--- a/ext/tk/lib/tk/frame.rb
+++ b/ext/tk/lib/tk/frame.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/frame.rb : treat frame widget
#
diff --git a/ext/tk/lib/tk/grid.rb b/ext/tk/lib/tk/grid.rb
index e1e07c44fa..5a4a26403a 100644
--- a/ext/tk/lib/tk/grid.rb
+++ b/ext/tk/lib/tk/grid.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/grid.rb : control grid geometry manager
#
diff --git a/ext/tk/lib/tk/image.rb b/ext/tk/lib/tk/image.rb
index 972383982f..ec23e495d0 100644
--- a/ext/tk/lib/tk/image.rb
+++ b/ext/tk/lib/tk/image.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/image.rb : treat Tk image objects
#
diff --git a/ext/tk/lib/tk/itemconfig.rb b/ext/tk/lib/tk/itemconfig.rb
index e8eb83d66c..e615fa0950 100644
--- a/ext/tk/lib/tk/itemconfig.rb
+++ b/ext/tk/lib/tk/itemconfig.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/itemconfig.rb : control item/tag configuration of widget
#
diff --git a/ext/tk/lib/tk/itemfont.rb b/ext/tk/lib/tk/itemfont.rb
index b5da4fa1ef..92f75ac388 100644
--- a/ext/tk/lib/tk/itemfont.rb
+++ b/ext/tk/lib/tk/itemfont.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/itemfont.rb : control font of widget items
#
diff --git a/ext/tk/lib/tk/kinput.rb b/ext/tk/lib/tk/kinput.rb
index b63f756def..6d2b3d7a7a 100644
--- a/ext/tk/lib/tk/kinput.rb
+++ b/ext/tk/lib/tk/kinput.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/kinput.rb : control kinput
#
diff --git a/ext/tk/lib/tk/label.rb b/ext/tk/lib/tk/label.rb
index 05e430e49b..48f67deb31 100644
--- a/ext/tk/lib/tk/label.rb
+++ b/ext/tk/lib/tk/label.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/label.rb : treat label widget
#
diff --git a/ext/tk/lib/tk/labelframe.rb b/ext/tk/lib/tk/labelframe.rb
index 6f679e55b5..f9497dc2f0 100644
--- a/ext/tk/lib/tk/labelframe.rb
+++ b/ext/tk/lib/tk/labelframe.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/labelframe.rb : treat labelframe widget
#
diff --git a/ext/tk/lib/tk/listbox.rb b/ext/tk/lib/tk/listbox.rb
index 6742b2132c..df4d422007 100644
--- a/ext/tk/lib/tk/listbox.rb
+++ b/ext/tk/lib/tk/listbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/listbox.rb : treat listbox widget
#
diff --git a/ext/tk/lib/tk/macpkg.rb b/ext/tk/lib/tk/macpkg.rb
index 3ca7953c13..abf9b176fb 100644
--- a/ext/tk/lib/tk/macpkg.rb
+++ b/ext/tk/lib/tk/macpkg.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/macpkg.rb : methods for Tcl/Tk packages for Macintosh
# 2000/11/22 by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>
diff --git a/ext/tk/lib/tk/menu.rb b/ext/tk/lib/tk/menu.rb
index bcd250026d..16347a98ea 100644
--- a/ext/tk/lib/tk/menu.rb
+++ b/ext/tk/lib/tk/menu.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/menu.rb : treat menu and menubutton
#
diff --git a/ext/tk/lib/tk/menubar.rb b/ext/tk/lib/tk/menubar.rb
index 9d5571c470..17cb4477c9 100644
--- a/ext/tk/lib/tk/menubar.rb
+++ b/ext/tk/lib/tk/menubar.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/menubar.rb
#
diff --git a/ext/tk/lib/tk/menuspec.rb b/ext/tk/lib/tk/menuspec.rb
index cb3597eec9..2de62242ff 100644
--- a/ext/tk/lib/tk/menuspec.rb
+++ b/ext/tk/lib/tk/menuspec.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/menuspec.rb
# Hidethoshi NAGAI (nagai@ai.kyutech.ac.jp)
diff --git a/ext/tk/lib/tk/message.rb b/ext/tk/lib/tk/message.rb
index 5f73b3066f..432e9667bd 100644
--- a/ext/tk/lib/tk/message.rb
+++ b/ext/tk/lib/tk/message.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/message.rb : treat message widget
#
diff --git a/ext/tk/lib/tk/mngfocus.rb b/ext/tk/lib/tk/mngfocus.rb
index a05fb94f8e..06b20eb6ab 100644
--- a/ext/tk/lib/tk/mngfocus.rb
+++ b/ext/tk/lib/tk/mngfocus.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/mngfocus.rb : methods for Tcl/Tk standard library 'focus.tcl'
# by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>
diff --git a/ext/tk/lib/tk/msgcat.rb b/ext/tk/lib/tk/msgcat.rb
index f2d0653c69..1e98889faf 100644
--- a/ext/tk/lib/tk/msgcat.rb
+++ b/ext/tk/lib/tk/msgcat.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/msgcat.rb : methods for Tcl message catalog
# by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>
diff --git a/ext/tk/lib/tk/namespace.rb b/ext/tk/lib/tk/namespace.rb
index 0119ba5ef7..1cab6fa060 100644
--- a/ext/tk/lib/tk/namespace.rb
+++ b/ext/tk/lib/tk/namespace.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/namespace.rb : methods to manipulate Tcl/Tk namespace
# by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>
diff --git a/ext/tk/lib/tk/optiondb.rb b/ext/tk/lib/tk/optiondb.rb
index 91d2697a86..b27a5e5721 100644
--- a/ext/tk/lib/tk/optiondb.rb
+++ b/ext/tk/lib/tk/optiondb.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/optiondb.rb : treat option database
#
diff --git a/ext/tk/lib/tk/optionobj.rb b/ext/tk/lib/tk/optionobj.rb
index 29b06da0eb..4219e4be71 100644
--- a/ext/tk/lib/tk/optionobj.rb
+++ b/ext/tk/lib/tk/optionobj.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/optionobj.rb : control options for a group of widgets
#
diff --git a/ext/tk/lib/tk/pack.rb b/ext/tk/lib/tk/pack.rb
index 220a38e524..45926d4043 100644
--- a/ext/tk/lib/tk/pack.rb
+++ b/ext/tk/lib/tk/pack.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/pack.rb : control pack geometry manager
#
diff --git a/ext/tk/lib/tk/package.rb b/ext/tk/lib/tk/package.rb
index 0c329732f5..fe6939c2d4 100644
--- a/ext/tk/lib/tk/package.rb
+++ b/ext/tk/lib/tk/package.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/package.rb : package command
#
diff --git a/ext/tk/lib/tk/palette.rb b/ext/tk/lib/tk/palette.rb
index 9462bb0667..e118e8dbe5 100644
--- a/ext/tk/lib/tk/palette.rb
+++ b/ext/tk/lib/tk/palette.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/palette.rb : methods for Tcl/Tk standard library 'palette.tcl'
# 1998/06/21 by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>
diff --git a/ext/tk/lib/tk/panedwindow.rb b/ext/tk/lib/tk/panedwindow.rb
index 04407802ea..285292f018 100644
--- a/ext/tk/lib/tk/panedwindow.rb
+++ b/ext/tk/lib/tk/panedwindow.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/panedwindow.rb : treat panedwindow
#
diff --git a/ext/tk/lib/tk/place.rb b/ext/tk/lib/tk/place.rb
index 109d866fda..efda36df5e 100644
--- a/ext/tk/lib/tk/place.rb
+++ b/ext/tk/lib/tk/place.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/place.rb : control place geometry manager
#
diff --git a/ext/tk/lib/tk/radiobutton.rb b/ext/tk/lib/tk/radiobutton.rb
index 627df6d9cf..b0858df2b4 100644
--- a/ext/tk/lib/tk/radiobutton.rb
+++ b/ext/tk/lib/tk/radiobutton.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/radiobutton.rb : treat radiobutton widget
#
diff --git a/ext/tk/lib/tk/root.rb b/ext/tk/lib/tk/root.rb
index b4f0bd107f..3fb7c472d3 100644
--- a/ext/tk/lib/tk/root.rb
+++ b/ext/tk/lib/tk/root.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/root.rb : treat root widget
#
diff --git a/ext/tk/lib/tk/scale.rb b/ext/tk/lib/tk/scale.rb
index 0bdcead7f2..f6f60e3c25 100644
--- a/ext/tk/lib/tk/scale.rb
+++ b/ext/tk/lib/tk/scale.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/scale.rb : treat scale widget
#
diff --git a/ext/tk/lib/tk/scrollable.rb b/ext/tk/lib/tk/scrollable.rb
index 96959b7a4b..e9b4a93d6d 100644
--- a/ext/tk/lib/tk/scrollable.rb
+++ b/ext/tk/lib/tk/scrollable.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/scrollable.rb : module for scrollable widget
#
diff --git a/ext/tk/lib/tk/scrollbar.rb b/ext/tk/lib/tk/scrollbar.rb
index c0ac201acb..c16ed38756 100644
--- a/ext/tk/lib/tk/scrollbar.rb
+++ b/ext/tk/lib/tk/scrollbar.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/scrollbar.rb : treat scrollbar widget
#
diff --git a/ext/tk/lib/tk/scrollbox.rb b/ext/tk/lib/tk/scrollbox.rb
index d20742a666..a470765d7c 100644
--- a/ext/tk/lib/tk/scrollbox.rb
+++ b/ext/tk/lib/tk/scrollbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/scrollbox.rb - Tk Listbox with Scrollbar
# as an example of Composite Widget
diff --git a/ext/tk/lib/tk/selection.rb b/ext/tk/lib/tk/selection.rb
index ba0a6f49f9..085d8b2d2d 100644
--- a/ext/tk/lib/tk/selection.rb
+++ b/ext/tk/lib/tk/selection.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/selection.rb : control selection
#
diff --git a/ext/tk/lib/tk/spinbox.rb b/ext/tk/lib/tk/spinbox.rb
index f2917d60ca..4be41c4266 100644
--- a/ext/tk/lib/tk/spinbox.rb
+++ b/ext/tk/lib/tk/spinbox.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/spinbox.rb - Tk spinbox classes
# by Yukihiro Matsumoto <matz@caelum.co.jp>
diff --git a/ext/tk/lib/tk/tagfont.rb b/ext/tk/lib/tk/tagfont.rb
index a1807395d2..e3fd60465c 100644
--- a/ext/tk/lib/tk/tagfont.rb
+++ b/ext/tk/lib/tk/tagfont.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/tagfont.rb : control font of tags
#
diff --git a/ext/tk/lib/tk/text.rb b/ext/tk/lib/tk/text.rb
index c18b3843b4..fc4f112933 100644
--- a/ext/tk/lib/tk/text.rb
+++ b/ext/tk/lib/tk/text.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/text.rb - Tk text classes
# by Yukihiro Matsumoto <matz@caelum.co.jp>
diff --git a/ext/tk/lib/tk/textimage.rb b/ext/tk/lib/tk/textimage.rb
index 99027a06fb..f7329c5dcc 100644
--- a/ext/tk/lib/tk/textimage.rb
+++ b/ext/tk/lib/tk/textimage.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/textimage.rb - treat Tk text image object
#
diff --git a/ext/tk/lib/tk/textmark.rb b/ext/tk/lib/tk/textmark.rb
index d1888c5e54..80945cc70c 100644
--- a/ext/tk/lib/tk/textmark.rb
+++ b/ext/tk/lib/tk/textmark.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/textmark.rb - methods for treating text marks
#
diff --git a/ext/tk/lib/tk/texttag.rb b/ext/tk/lib/tk/texttag.rb
index 96692014e4..9f11c6539b 100644
--- a/ext/tk/lib/tk/texttag.rb
+++ b/ext/tk/lib/tk/texttag.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/texttag.rb - methods for treating text tags
#
diff --git a/ext/tk/lib/tk/textwindow.rb b/ext/tk/lib/tk/textwindow.rb
index 49327b2c81..e0be5bac7a 100644
--- a/ext/tk/lib/tk/textwindow.rb
+++ b/ext/tk/lib/tk/textwindow.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/textwindow.rb - treat Tk text window object
#
diff --git a/ext/tk/lib/tk/timer.rb b/ext/tk/lib/tk/timer.rb
index 29aa84b0d9..794463aab1 100644
--- a/ext/tk/lib/tk/timer.rb
+++ b/ext/tk/lib/tk/timer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/timer.rb : methods for Tcl/Tk after command
#
diff --git a/ext/tk/lib/tk/tk_mac.rb b/ext/tk/lib/tk/tk_mac.rb
index 77bb2349cc..ed90fd1c67 100644
--- a/ext/tk/lib/tk/tk_mac.rb
+++ b/ext/tk/lib/tk/tk_mac.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/tk_mac.rb : Access Mac-Specific functionality on OS X from Tk
# (supported by Tk8.6 or later)
diff --git a/ext/tk/lib/tk/toplevel.rb b/ext/tk/lib/tk/toplevel.rb
index 30ef009517..e66b0fc1be 100644
--- a/ext/tk/lib/tk/toplevel.rb
+++ b/ext/tk/lib/tk/toplevel.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/toplevel.rb : treat toplevel widget
#
diff --git a/ext/tk/lib/tk/ttk_selector.rb b/ext/tk/lib/tk/ttk_selector.rb
index cc9e9928cb..4589e7fc29 100644
--- a/ext/tk/lib/tk/ttk_selector.rb
+++ b/ext/tk/lib/tk/ttk_selector.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# ttk_selector
#
diff --git a/ext/tk/lib/tk/txtwin_abst.rb b/ext/tk/lib/tk/txtwin_abst.rb
index 540f806d17..3c9beef6c4 100644
--- a/ext/tk/lib/tk/txtwin_abst.rb
+++ b/ext/tk/lib/tk/txtwin_abst.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/txtwin_abst.rb : TkTextWin abstruct class
#
diff --git a/ext/tk/lib/tk/validation.rb b/ext/tk/lib/tk/validation.rb
index 0ebd5c51b7..c6cbfb280e 100644
--- a/ext/tk/lib/tk/validation.rb
+++ b/ext/tk/lib/tk/validation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/validation.rb - validation support module for entry, spinbox, and so on
#
diff --git a/ext/tk/lib/tk/variable.rb b/ext/tk/lib/tk/variable.rb
index 496225a92d..8ac0fc6ace 100644
--- a/ext/tk/lib/tk/variable.rb
+++ b/ext/tk/lib/tk/variable.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/variable.rb : treat Tk variable object
#
diff --git a/ext/tk/lib/tk/virtevent.rb b/ext/tk/lib/tk/virtevent.rb
index c11e9692e7..de3c33da36 100644
--- a/ext/tk/lib/tk/virtevent.rb
+++ b/ext/tk/lib/tk/virtevent.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/virtevent.rb : treats virtual events
# 1998/07/16 by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>
diff --git a/ext/tk/lib/tk/winfo.rb b/ext/tk/lib/tk/winfo.rb
index b10cfe6760..36f32e5952 100644
--- a/ext/tk/lib/tk/winfo.rb
+++ b/ext/tk/lib/tk/winfo.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/winfo.rb : methods for winfo command
#
diff --git a/ext/tk/lib/tk/winpkg.rb b/ext/tk/lib/tk/winpkg.rb
index 80e0439ace..2a8f724bef 100644
--- a/ext/tk/lib/tk/winpkg.rb
+++ b/ext/tk/lib/tk/winpkg.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/winpkg.rb : methods for Tcl/Tk packages for Microsoft Windows
# 2000/11/22 by Hidetoshi Nagai <nagai@ai.kyutech.ac.jp>
diff --git a/ext/tk/lib/tk/wm.rb b/ext/tk/lib/tk/wm.rb
index fcd5a2cbd2..114ba24276 100644
--- a/ext/tk/lib/tk/wm.rb
+++ b/ext/tk/lib/tk/wm.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/wm.rb : methods for wm command
#
diff --git a/ext/tk/lib/tk/xim.rb b/ext/tk/lib/tk/xim.rb
index c0126c5175..7e77591b45 100644
--- a/ext/tk/lib/tk/xim.rb
+++ b/ext/tk/lib/tk/xim.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
#
# tk/xim.rb : control imput_method
#