[ruby-core:102037] [Ruby master Bug#17531] `did_you_mean` not Ractor friendly

Issue #17531 has been reported by marcandre (Marc-Andre Lafortune).

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Bug #17531: `did_you_mean` not Ractor friendly
https://bugs.ruby-lang.org/issues/17531

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: yuki24 (Yuki Nishijima)
* ruby -v: 3.0.0p0
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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The gem `did_you_mean` uses a class instance variable that does not work with Ractor.

```
$ RUBYOPT='--disable-did_you_mean' ruby -W0 -e 'Ractor.new{ begin ; nil + 42; rescue Exception => e; e.to_s end}.take'
# => prints nothing (ok)

$ ruby -W0 -e 'Ractor.new{ begin ; nil + 42; rescue Exception => e; e.to_s end}.take'
# Prints
/Users/mal/.rbenv/versions/3.0.0/lib/ruby/3.0.0/did_you_mean.rb:102:in `formatter'
/Users/mal/.rbenv/versions/3.0.0/lib/ruby/3.0.0/did_you_mean/core_ext/name_error.rb:9:in `to_s'
-e:1:in `rescue in block in <main>'
-e:1:in `block in <main>'
# (not ok)
```



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