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-rw-r--r--test/ruby/test_io.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index a6df5c8b08..7337ed69e5 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -3303,7 +3303,7 @@ __END__
assert_equal(0, STDIN.fileno)
assert_equal(1, STDOUT.fileno)
assert_equal(2, STDERR.fileno)
- assert_equal(0, $stdin.fileno)
+ assert_equal(0, $stdin.fileno, "#fileno on #{$stdin.class}")
assert_equal(1, $stdout.fileno)
assert_equal(2, $stderr.fileno)
end