https://git.ruby-lang.org/ruby.git/commit/?id=be04006c7d

From be04006c7d2f9aeb7e9d8d09d945b3a9c7850202 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Mon, 13 Sep 2021 20:56:34 +0900
Subject: Rename capture_io to capture_output and deprecate to use capture_io

---
 tool/lib/test/unit/assertions.rb | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/tool/lib/test/unit/assertions.rb b/tool/lib/test/unit/assertions.rb
index 814dd44..ecbcf74 100644
--- a/tool/lib/test/unit/assertions.rb
+++ b/tool/lib/test/unit/assertions.rb
@@ -312,19 +312,15 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit/assertions.rb#L312
       ##
       # Captures $stdout and $stderr into strings:
       #
-      #   out, err = capture_io do
+      #   out, err = capture_output do
       #     puts "Some info"
       #     warn "You did a bad thing"
       #   end
       #
       #   assert_match %r%info%, out
       #   assert_match %r%bad%, err
-      #
-      # NOTE: For efficiency, this method uses StringIO and does not
-      # capture IO for subprocesses. Use #capture_subprocess_io for
-      # that.
 
-      def capture_io
+      def capture_output
         require 'stringio'
 
         captured_stdout, captured_stderr = StringIO.new, StringIO.new
@@ -343,7 +339,10 @@ module Test https://github.com/ruby/ruby/blob/trunk/tool/lib/test/unit/assertions.rb#L339
 
         return captured_stdout.string, captured_stderr.string
       end
-      alias capture_output capture_io
+
+      def capture_io
+        raise NoMethodError, "use capture_output"
+      end
 
       ##
       # Returns details for exception +e+
-- 
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