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-rw-r--r--test/-ext-/bignum/test_mul.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/-ext-/bignum/test_mul.rb b/test/-ext-/bignum/test_mul.rb
index 3e78247aa45..103a00fbad2 100644
--- a/test/-ext-/bignum/test_mul.rb
+++ b/test/-ext-/bignum/test_mul.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: false
require 'test/unit'
require "-test-/bignum"