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-rw-r--r--ext/socket/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/socket/extconf.rb b/ext/socket/extconf.rb
index 1c716c4..fd70be4 100644
--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'mkmf'
AF_INET6_SOCKET_CREATION_TEST = <<EOF