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-rw-r--r--test/-ext-/string/test_coderange.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/-ext-/string/test_coderange.rb b/test/-ext-/string/test_coderange.rb
index 31f5c871f5..18b256fcea 100644
--- a/test/-ext-/string/test_coderange.rb
+++ b/test/-ext-/string/test_coderange.rb
@@ -1,4 +1,5 @@
# coding: ascii-8bit
+# frozen_string_literal: false
require 'test/unit'
require "-test-/string"
require "rbconfig/sizeof"