[ruby/irb] Fix exit! command warning and method behavior

(https://github.com/ruby/irb/pull/868)

* Fix exit! command warning and method behavior

* Remove arg(0) from Kernel.exit and Kernel.exit!

https://github.com/ruby/irb/commit/372bc59bf5

2 files changed, 13 insertions, 3 deletions

diff --git a/test/irb/cmd/test_force_exit.rb b/test/irb/cmd/test_force_exit.rb
index 191a786872..9e86c644d6 100644
--- a/test/irb/cmd/test_force_exit.rb
+++ b/test/irb/cmd/test_force_exit.rb
@@ -47,5 +47,17 @@ module TestIRB
 
       assert_match(/irb\(main\):001> 123/, output)
     end
+
+    def test_forced_exit_out_of_irb_session
+      write_ruby <<~'ruby'
+        at_exit { puts 'un' + 'reachable' }
+        binding.irb
+        exit! # this will call exit! method overrided by command
+      ruby
+      output = run_ruby_file do
+        type "exit"
+      end
+      assert_not_include(output, 'unreachable')
+    end
   end
 end
diff --git a/test/irb/test_cmd.rb b/test/irb/test_cmd.rb
index 7d7353281e..349d2c0457 100644
--- a/test/irb/test_cmd.rb
+++ b/test/irb/test_cmd.rb
@@ -58,9 +58,7 @@ module TestIRB
         "irb_info",
         main: main
       )
-      # Because the main object is frozen, IRB would wrap a delegator around it
-      # Which's exit! method can't be overridden and would raise a warning
-      assert_match(/delegator does not forward private method #exit\!/, err)
+      assert_empty(err)
       assert_match(/RUBY_PLATFORM/, out)
     end
   end