https://git.ruby-lang.org/ruby.git/commit/?id=c4162a4cb8

From c4162a4cb82278b0674452304c96b5775d5b7d6d Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Sat, 22 May 2021 14:32:22 +0900
Subject: Refined portability of test for [Bug #17739]

The order of arguments to callback of qsort is not defined.
That means `a` may not be 3 at all.
---
 test/ruby/test_array.rb | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/test/ruby/test_array.rb b/test/ruby/test_array.rb
index 0a9ba90..8f05f9c 100644
--- a/test/ruby/test_array.rb
+++ b/test/ruby/test_array.rb
@@ -1667,10 +1667,11 @@ class TestArray < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_array.rb#L1667
     array = [1, 2, 3, 4, 5]
     frozen_array = nil
     assert_raise(FrozenError) do
+      count = 0
       array.sort! do |a, b|
-        array.freeze if a == 3
+        array.freeze if (count += 1) == 6
         frozen_array ||= array.map.to_a if array.frozen?
-        1
+        b <=> a
       end
     end
     assert_equal(frozen_array, array)
-- 
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