Issue #15718 has been updated by nobu (Nobuyoshi Nakada).


It may be related to a code range bug.
By adding `o.valid_encoding?` to `Psych::Visitors::YAMLTree#visit_String`, the error raises in ruby 24 too.

----------------------------------------
Bug #15718: YAML raises error when dumping strings with UTF32 encoding
https://bugs.ruby-lang.org/issues/15718#change-77238

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6.2p247
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
```shell
ruby -r yaml -e "p YAML.dump( ''.force_encoding('UTF-32LE') )"

Traceback (most recent call last):
	4: from -e:1:in `<main>'
	3: from /Users/work/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/psych.rb:513:in `dump'
	2: from /Users/work/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/psych/visitors/yaml_tree.rb:118:in `push'
	1: from /Users/work/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/psych/visitors/yaml_tree.rb:136:in `accept'
/Users/work/.rvm/rubies/ruby-2.6.1/lib/ruby/2.6.0/psych/visitors/yaml_tree.rb:298:in `visit_String': incompatible encoding regexp match (US-ASCII regexp with UTF-32LE string) (Encoding::CompatibilityError)
```

Surprisingly, this works in Ruby 2.4.x, but not in 2.2, 2.3, 2.5 nor 2.6!



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