https://git.ruby-lang.org/ruby.git/commit/?id=278522f053

From 278522f0535d081ff6473f210cb45f923ff8810a Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Fri, 19 Mar 2021 19:08:39 -0700
Subject: [ruby/irb] Don't call Ruby 2.4+'s String#pretty_print

https://github.com/ruby/irb/commit/89bcf107be
---
 lib/irb/color_printer.rb       | 9 +++++++++
 test/irb/test_color_printer.rb | 1 +
 2 files changed, 10 insertions(+)

diff --git a/lib/irb/color_printer.rb b/lib/irb/color_printer.rb
index 92afea5..30c6825 100644
--- a/lib/irb/color_printer.rb
+++ b/lib/irb/color_printer.rb
@@ -21,6 +21,15 @@ module IRB https://github.com/ruby/ruby/blob/trunk/lib/irb/color_printer.rb#L21
       end
     end
 
+    def pp(obj)
+      if obj.is_a?(String)
+        # Avoid calling Ruby 2.4+ String#pretty_print that splits a string by "\n"
+        text(obj.inspect)
+      else
+        super
+      end
+    end
+
     def text(str, width = nil)
       unless str.is_a?(String)
         str = str.inspect
diff --git a/test/irb/test_color_printer.rb b/test/irb/test_color_printer.rb
index 1b28837..1afc7cc 100644
--- a/test/irb/test_color_printer.rb
+++ b/test/irb/test_color_printer.rb
@@ -34,6 +34,7 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_color_printer.rb#L34
       end
       {
         1 => "#{BLUE}#{BOLD}1#{CLEAR}\n",
+        "a\nb" => %[#{RED}#{BOLD}"#{CLEAR}#{RED}a\\nb#{CLEAR}#{RED}#{BOLD}"#{CLEAR}\n],
         IRBTestColorPrinter.new('test') => "#{GREEN}#<struct TestIRB::TestColorPrinter::IRBTestColorPrinter#{CLEAR} a#{GREEN}=#{CLEAR}#{RED}#{BOLD}\"#{CLEAR}#{RED}test#{CLEAR}#{RED}#{BOLD}\"#{CLEAR}#{GREEN}>#{CLEAR}\n",
         Ripper::Lexer.new('1').scan => "[#{GREEN}#<Ripper::Lexer::Elem:#{CLEAR} on_int@1:0 END token: #{RED}#{BOLD}\"#{CLEAR}#{RED}1#{CLEAR}#{RED}#{BOLD}\"#{CLEAR}#{GREEN}>#{CLEAR}]\n",
         Class.new{define_method(:pretty_print){|q| q.text("[__FILE__, __LINE__, __ENCODING__]")}}.new => "[#{CYAN}#{BOLD}__FILE__#{CLEAR}, #{CYAN}#{BOLD}__LINE__#{CLEAR}, #{CYAN}#{BOLD}__ENCODING__#{CLEAR}]\n",
-- 
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