https://git.ruby-lang.org/ruby.git/commit/?id=3f0b4665df

From 3f0b4665df786990799c4cbac4de3a3cafb5e6bc Mon Sep 17 00:00:00 2001
From: Nobuhiro IMAI <nov@y...>
Date: Wed, 13 Jan 2021 23:36:10 +0900
Subject: [ruby/irb] handle `__ENCODING__` as a keyword as well

https://github.com/ruby/irb/commit/a6a33d908f

diff --git a/lib/irb/color.rb b/lib/irb/color.rb
index 8162699..a054bb2 100644
--- a/lib/irb/color.rb
+++ b/lib/irb/color.rb
@@ -17,7 +17,7 @@ module IRB # :nodoc: https://github.com/ruby/ruby/blob/trunk/lib/irb/color.rb#L17
     CYAN      = 36
 
     TOKEN_KEYWORDS = {
-      on_kw: ['nil', 'self', 'true', 'false', '__FILE__', '__LINE__'],
+      on_kw: ['nil', 'self', 'true', 'false', '__FILE__', '__LINE__', '__ENCODING__'],
       on_const: ['ENV'],
     }
     private_constant :TOKEN_KEYWORDS
diff --git a/test/irb/test_color.rb b/test/irb/test_color.rb
index b136d38..d035e44 100644
--- a/test/irb/test_color.rb
+++ b/test/irb/test_color.rb
@@ -50,7 +50,7 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_color.rb#L50
         '"#{}"' => "#{RED}#{BOLD}\"#{CLEAR}#{RED}\#{#{CLEAR}#{RED}}#{CLEAR}#{RED}#{BOLD}\"#{CLEAR}",
         ':"a#{}b"' => "#{YELLOW}:\"#{CLEAR}#{YELLOW}a#{CLEAR}#{YELLOW}\#{#{CLEAR}#{YELLOW}}#{CLEAR}#{YELLOW}b#{CLEAR}#{YELLOW}\"#{CLEAR}",
         ':"a#{ def b; end; \'c\' + "#{ :d }" }e"' => "#{YELLOW}:\"#{CLEAR}#{YELLOW}a#{CLEAR}#{YELLOW}\#{#{CLEAR} #{GREEN}def#{CLEAR} #{BLUE}#{BOLD}b#{CLEAR}; #{GREEN}end#{CLEAR}; #{RED}#{BOLD}'#{CLEAR}#{RED}c#{CLEAR}#{RED}#{BOLD}'#{CLEAR} + #{RED}#{BOLD}\"#{CLEAR}#{RED}\#{#{CLEAR} #{YELLOW}:#{CLEAR}#{YELLOW}d#{CLEAR} #{RED}}#{CLEAR}#{RED}#{BOLD}\"#{CLEAR} #{YELLOW}}#{CLEAR}#{YELLOW}e#{CLEAR}#{YELLOW}\"#{CLEAR}",
-        "[__FILE__, __LINE__]" => "[#{CYAN}#{BOLD}__FILE__#{CLEAR}, #{CYAN}#{BOLD}__LINE__#{CLEAR}]",
+        "[__FILE__, __LINE__, __ENCODING__]" => "[#{CYAN}#{BOLD}__FILE__#{CLEAR}, #{CYAN}#{BOLD}__LINE__#{CLEAR}, #{CYAN}#{BOLD}__ENCODING__#{CLEAR}]",
         ":self" => "#{YELLOW}:#{CLEAR}#{YELLOW}self#{CLEAR}",
         ":class" => "#{YELLOW}:#{CLEAR}#{YELLOW}class#{CLEAR}",
         "[:end, 2]" => "[#{YELLOW}:#{CLEAR}#{YELLOW}end#{CLEAR}, #{BLUE}#{BOLD}2#{CLEAR}]",
@@ -163,6 +163,7 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_color.rb#L163
         1 => "#{BLUE}#{BOLD}1#{CLEAR}\n",
         IRBTestColorPrinter.new('test') => "#{GREEN}#<struct TestIRB::TestColor::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",
       }.each do |object, result|
         actual = with_term { IRB::ColorPrinter.pp(object, '') }
         assert_equal(result, actual, "Case: IRB::ColorPrinter.pp(#{object.inspect}, '')")
-- 
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