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-rw-r--r--ext/io/console/extconf.rb1
-rw-r--r--ext/io/console/lib/console/size.rb1
-rw-r--r--ext/io/nonblock/extconf.rb1
-rw-r--r--ext/io/wait/extconf.rb1
4 files changed, 4 insertions, 0 deletions
diff --git a/ext/io/console/extconf.rb b/ext/io/console/extconf.rb
index fa4aac840b..a4dbd0ff04 100644
--- a/ext/io/console/extconf.rb
+++ b/ext/io/console/extconf.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'mkmf'
ok = true
diff --git a/ext/io/console/lib/console/size.rb b/ext/io/console/lib/console/size.rb
index 519bc3be6d..f17206dfcf 100644
--- a/ext/io/console/lib/console/size.rb
+++ b/ext/io/console/lib/console/size.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
# fallback to console window size
def IO.default_console_size
[
diff --git a/ext/io/nonblock/extconf.rb b/ext/io/nonblock/extconf.rb
index aecdc16cea..d813a01e7c 100644
--- a/ext/io/nonblock/extconf.rb
+++ b/ext/io/nonblock/extconf.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'mkmf'
target = "io/nonblock"
diff --git a/ext/io/wait/extconf.rb b/ext/io/wait/extconf.rb
index eed3543124..b5d36c3fe3 100644
--- a/ext/io/wait/extconf.rb
+++ b/ext/io/wait/extconf.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'mkmf'
target = "io/wait"