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-rw-r--r--test/ruby/test_env.rb4
1 files changed, 2 insertions, 2 deletions
diff --git a/test/ruby/test_env.rb b/test/ruby/test_env.rb
index cdadeac148..4b5f18e7bb 100644
--- a/test/ruby/test_env.rb
+++ b/test/ruby/test_env.rb
@@ -612,8 +612,8 @@ class TestEnv < Test::Unit::TestCase
<<-"end;"
envvars_to_check = [
"foo\0bar",
- "#{'\xa1\xa1'}".force_encoding(Encoding::UTF_16LE),
- "foo".force_encoding(Encoding::ISO_2022_JP),
+ "#{'\xa1\xa1'}".dup.force_encoding(Encoding::UTF_16LE),
+ "foo".dup.force_encoding(Encoding::ISO_2022_JP),
]
envvars_to_check.each do |#{var_name}|
#{str_for_yielding_exception_class(code_str)}