1) Failure:
TestEncoding#test_ractor_lazy_load_encoding_concurrently [/tmp/ruby/src/trunk/test/ruby/test_encoding.rb:141]:
assert_separately failed with error message
pid 315058 exit 1
| #<Thread:0x0000721c69ba0cc8 run> terminated with exception (report_on_exception is true):
| -:20:in 'String#force_encoding': wrong encoding index 84 for GB12345 (expected 83) (EncodingError)
| 	from -:20:in 'block (3 levels) in <main>'
| 	from -:19:in 'Array#each'
| 	from -:19:in 'block (2 levels) in <main>'
| /tmp/ruby/src/trunk/tool/lib/core_assertions.rb:297:in 'Marshal.dump': no _dump_data is defined for class Ractor (TypeError)
| 	from /tmp/ruby/src/trunk/tool/lib/core_assertions.rb:297:in 'block in Test::Unit::CoreAssertions#separated_runner'
| -:25:in 'Ractor.select': thrown by remote Ractor. (Ractor::RemoteError)
| 	from -:25:in '<main>'
| -:20:in 'String#force_encoding': wrong encoding index 84 for GB12345 (expected 83) (EncodingError)
| 	from -:20:in 'block (3 levels) in <main>'
| 	from -:19:in 'Array#each'
| 	from -:19:in 'block (2 levels) in <main>'
| -:25:in 'Ractor.select': thrown by remote Ractor. (Ractor::RemoteError)
| 	from -:25:in '<main>'
| -:20:in 'String#force_encoding': wrong encoding index 84 for GB12345 (expected 83) (EncodingError)
| 	from -:20:in 'block (3 levels) in <main>'
| 	from -:19:in 'Array#each'
| 	from -:19:in 'block (2 levels) in <main>'
1) Failure: