https://git.ruby-lang.org/ruby.git/commit/?id=332d1e52e6

From 332d1e52e62735ff16e5fb9207ce86695369555d Mon Sep 17 00:00:00 2001
From: Yuta Saito <kateinoigakukun@g...>
Date: Mon, 13 Dec 2021 16:48:57 +0900
Subject: btest: assign $stderr = STDOUT instead of IO#reopen to be more
 portable

`IO#reopen` internally uses dup syscall but some platforms don't support
the syscall. re-assigning `$stderr` is enough to capture the interpreter's
errors and warnings.
---
 bootstraptest/test_eval.rb   | 4 ++--
 bootstraptest/test_jump.rb   | 4 ++--
 bootstraptest/test_syntax.rb | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/bootstraptest/test_eval.rb b/bootstraptest/test_eval.rb
index efc22efff40..a9f389c6734 100644
--- a/bootstraptest/test_eval.rb
+++ b/bootstraptest/test_eval.rb
@@ -218,7 +218,7 @@ assert_equal %q{[10, main]}, %q{ https://github.com/ruby/ruby/blob/trunk/bootstraptest/test_eval.rb#L218
 
 %w[break next redo].each do |keyword|
   assert_match %r"Can't escape from eval with #{keyword}\b", %{
-    STDERR.reopen(STDOUT)
+    $stderr = STDOUT
     begin
       eval "0 rescue #{keyword}"
     rescue SyntaxError => e
@@ -228,7 +228,7 @@ assert_equal %q{[10, main]}, %q{ https://github.com/ruby/ruby/blob/trunk/bootstraptest/test_eval.rb#L228
 end
 
 assert_normal_exit %q{
-  STDERR.reopen(STDOUT)
+  $stderr = STDOUT
   class Foo
      def self.add_method
        class_eval("def some-bad-name; puts 'hello' unless @some_variable.some_function(''); end")
diff --git a/bootstraptest/test_jump.rb b/bootstraptest/test_jump.rb
index 18a2737ea33..d07c47a56d7 100644
--- a/bootstraptest/test_jump.rb
+++ b/bootstraptest/test_jump.rb
@@ -147,7 +147,7 @@ assert_equal %q{131}, %q{ https://github.com/ruby/ruby/blob/trunk/bootstraptest/test_jump.rb#L147
   }
 }
 assert_match %r{Invalid retry}, %q{
-STDERR.reopen(STDOUT)
+$stderr = STDOUT
 begin
   eval %q{
     1.times{
@@ -297,7 +297,7 @@ assert_equal "true", %q{ https://github.com/ruby/ruby/blob/trunk/bootstraptest/test_jump.rb#L297
 }, '[ruby-core:21379]'
 
 assert_match %r{Invalid yield}, %q{
-STDERR.reopen(STDOUT)
+$stderr = STDOUT
 begin
   eval %q{
     class Object
diff --git a/bootstraptest/test_syntax.rb b/bootstraptest/test_syntax.rb
index fa27bf2aeb3..948e2d7809e 100644
--- a/bootstraptest/test_syntax.rb
+++ b/bootstraptest/test_syntax.rb
@@ -628,7 +628,7 @@ assert_equal '2', %q{ https://github.com/ruby/ruby/blob/trunk/bootstraptest/test_syntax.rb#L628
 }
 
 assert_match /invalid multibyte char/, %q{
-  STDERR.reopen(STDOUT)
+  $stderr = STDOUT
   eval("\"\xf0".force_encoding("utf-8"))
 }, '[ruby-dev:32429]'
 
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