[ruby/irb] Treat encodings in exception correctly

4452adbe04

test/irb/test_raise_no_backtrace_exception.rb

@@ -21,5 +21,30 @@ IRB
         raise StandardError, "A\\xf3B"
       IRB
     end
+
+    def test_raise_exception_with_different_encoding_containing_invalid_byte_sequence
+      skip if RUBY_ENGINE == 'truffleruby'
+      backup_home = ENV["HOME"]
+      Dir.mktmpdir("test_irb_raise_no_backtrace_exception_#{$$}") do |tmpdir|
+        ENV["HOME"] = tmpdir
+
+        bundle_exec = ENV.key?('BUNDLE_GEMFILE') ? ['-rbundler/setup'] : []
+        File.open('euc.rb', 'w') do |f|
+          f.write(<<~EOF)
+            # encoding: euc-jp
+
+            def raise_euc_with_invalid_byte_sequence
+              raise "\xA4\xA2\\xFF"
+            end
+          EOF
+        end
+        assert_in_out_err(bundle_exec + %w[-rirb -W0 -e ENV[%(LC_ALL)]=%(ja_JP.UTF-8) -e ENV[%(LANG)]=%(ja_JP.UTF-8) -e IRB.start(__FILE__) -- -f --], <<~IRB, /`raise_euc_with_invalid_byte_sequence': あ\\xFF \(RuntimeError\)/, [])
+          require_relative 'euc'
+          raise_euc_with_invalid_byte_sequence
+        IRB
+      end
+    ensure
+      ENV["HOME"] = backup_home
+    end
   end
 end