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-rw-r--r--test/t/string.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/t/string.rb b/test/t/string.rb
index 8f008c6a7..e0f0eb99c 100644
--- a/test/t/string.rb
+++ b/test/t/string.rb
@@ -579,7 +579,7 @@ assert('String#sub', '15.2.10.5.36') do
str = "abc"
miss = str.sub("X", "Z")
assert_equal str, miss
- assert_not_equal str.object_id, miss.object_id
+ assert_not_same str, miss
a = []
assert_equal '.abc', "abc".sub("") { |i| a << i; "." }