[ruby/irb] Add East Asian Ambiguous Width to irb_info command

https://github.com/ruby/irb/commit/4cade4b7e5

lib/irb/cmd/info.rb

@@ -16,6 +16,7 @@ module IRB
             str += "RUBY_PLATFORM: #{RUBY_PLATFORM}\n"
             str += "LANG env: #{ENV["LANG"]}\n" if ENV["LANG"] && !ENV["LANG"].empty?
             str += "LC_ALL env: #{ENV["LC_ALL"]}\n" if ENV["LC_ALL"] && !ENV["LC_ALL"].empty?
+            str += "East Asian Ambiguous Width: #{Reline.ambiguous_width.inspect}\n"
             if RbConfig::CONFIG['host_os'] =~ /mswin|msys|mingw|cygwin|bccwin|wince|emc/
               codepage = `chcp`.sub(/.*: (\d+)\n/, '\1')
               str += "Code page: #{codepage}\n"

test/irb/test_cmd.rb

@@ -81,6 +81,7 @@ module TestIRB
         InputMethod:\sAbstract\sInputMethod\n
         \.irbrc\spath:\s.+\n
         RUBY_PLATFORM:\s.+\n
+        East\sAsian\sAmbiguous\sWidth:\s\d\n
         #{@is_win ? 'Code\spage:\s\d+\n' : ''}
       }x
       assert_match expected, irb.context.main.irb_info.to_s
@@ -107,6 +108,7 @@ module TestIRB
         InputMethod:\sAbstract\sInputMethod\n
         \.irbrc\spath:\s.+\n
         RUBY_PLATFORM:\s.+\n
+        East\sAsian\sAmbiguous\sWidth:\s\d\n
         #{@is_win ? 'Code\spage:\s\d+\n' : ''}
       }x
       assert_match expected, irb.context.main.irb_info.to_s
@@ -135,6 +137,7 @@ module TestIRB
         IRB\sversion:\sirb\s.+\n
         InputMethod:\sAbstract\sInputMethod\n
         RUBY_PLATFORM:\s.+\n
+        East\sAsian\sAmbiguous\sWidth:\s\d\n
         #{@is_win ? 'Code\spage:\s\d+\n' : ''}
         \z
       }x
@@ -167,6 +170,7 @@ module TestIRB
         IRB\sversion:\sirb\s.+\n
         InputMethod:\sAbstract\sInputMethod\n
         RUBY_PLATFORM:\s.+\n
+        East\sAsian\sAmbiguous\sWidth:\s\d\n
         #{@is_win ? 'Code\spage:\s\d+\n' : ''}
         \z
       }x
@@ -201,6 +205,7 @@ module TestIRB
         RUBY_PLATFORM: .+\n
         LANG\senv:\sja_JP\.UTF-8\n
         LC_ALL\s env:\sen_US\.UTF-8\n
+        East\sAsian\sAmbiguous\sWidth:\s\d\n
       }x
       assert_match expected, irb.context.main.irb_info.to_s
     ensure