[ruby-core:105685] [Ruby master Bug#18130] Showing exceptions from Ractor on console causes errors

Issue #18130 has been updated by mame (Yusuke Endoh).

Assignee set to ko1 (Koichi Sasada)
Status changed from Open to Assigned

Thanks. I have another PR for the same issue in https://github.com/ruby/error_highlight/pull/11

I'm okay for the change, but I'd like @ko1 to review the change.

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Bug #18130: Showing exceptions from Ractor on console causes errors
https://bugs.ruby-lang.org/issues/18130#change-94185

* Author: tagomoris (Satoshi TAGOMORI)
* Status: Assigned
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* ruby -v: ruby 3.1.0dev (2021-08-13T06:26:44Z master ac4d53bd46) [arm64-darwin20]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
`ErrorHighlight.formatter` fetches a default (or configured) exception formatter from the module variable, and if it occurs in Ractor, it causes additional exceptions.

```
/Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/error_highlight/formatter.rb:21:in `formatter': can not access non-shareable objects in constant ErrorHighlight::DEFAULT_FORMATTER by non-main ractor. (Ractor::IsolationError)
	from /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/error_highlight/core_ext.rb:36:in `to_s'
	from /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/core_ext/name_error.rb:21:in `rescue in to_s'
	from /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/core_ext/name_error.rb:14:in `to_s'
	from snippets/ractor_server.rb:21:in `message'
	from snippets/ractor_server.rb:21:in `full_message'
	from snippets/ractor_server.rb:21:in `rescue in block (2 levels) in <main>'
	from snippets/ractor_server.rb:10:in `block (2 levels) in <main>'
```




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