The command "irb_info" should show RUBY_PLATFORM

Author: aycabta

lib/irb/cmd/info.rb

@@ -13,6 +13,7 @@ def inspect
             str += "IRB version: #{IRB.version}\n"
             str += "InputMethod: #{IRB.CurrentContext.io.inspect}\n"
             str += ".irbrc path: #{IRB.rc_file}\n" if File.exist?(IRB.rc_file)
+            str += "RUBY_PLATFORM: #{RUBY_PLATFORM}\n"
             str
           end
           alias_method :to_s, :inspect

test/irb/test_cmd.rb

@@ -48,7 +48,8 @@ def test_irb_info_multiline
         Ruby\sversion: .+\n
         IRB\sversion:\sirb .+\n
         InputMethod:\sReidlineInputMethod\swith\sReline .+ and .+\n
-        \.irbrc\spath: .+
+        \.irbrc\spath: .+\n
+        RUBY_PLATFORM: .+
       }x
       assert_match expected, irb.context.main.irb_info.to_s
     end
@@ -67,7 +68,8 @@ def test_irb_info_singleline
         Ruby\sversion: .+\n
         IRB\sversion:\sirb .+\n
         InputMethod:\sReadlineInputMethod\swith .+ and .+\n
-        \.irbrc\spath: .+
+        \.irbrc\spath: .+\n
+        RUBY_PLATFORM: .+
       }x
       assert_match expected, irb.context.main.irb_info.to_s
     end
@@ -89,6 +91,7 @@ def test_irb_info_multiline_without_rc_files
         Ruby\sversion: .+\n
         IRB\sversion:\sirb .+\n
         InputMethod:\sReidlineInputMethod\swith\sReline\s[^ ]+(?!\sand\s.+)\n
+        RUBY_PLATFORM: .+\n
         \z
       }x
       assert_match expected, irb.context.main.irb_info.to_s
@@ -115,6 +118,7 @@ def test_irb_info_singleline_without_rc_files
         Ruby\sversion: .+\n
         IRB\sversion:\sirb .+\n
         InputMethod:\sReadlineInputMethod\swith\s(?~.*\sand\s.+)\n
+        RUBY_PLATFORM: .+\n
         \z
       }x
       assert_match expected, irb.context.main.irb_info.to_s