[ruby-core:93254] [Ruby trunk Bug#15941] Issue with String#scrub when given block and receiver is modified in block

Issue #15941 has been updated by luke-gru (Luke Gruber).


This causes a segmentation fault:

```
s = "abc\u3042\xE3\x80"
loop do
    s.scrub{|bytes| s << "more content"; "?" }
end
```
Not something that should occur in real code, but nevertheless a bug.
Thank you for your time :)

----------------------------------------
Bug #15941: Issue with String#scrub when given block and receiver is modified in block
https://bugs.ruby-lang.org/issues/15941#change-78703

* Author: luke-gru (Luke Gruber)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
This should cause a segmentation fault:

```ruby
s = "abc\u3042\xE3\x80"
loop do
    s.scrub{|bytes| s << "more content"; "?" }
end
```

Not something that should happen, but I thought it might cause undesired behavior.
Thank you for your time :)



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