Issue #17661 has been reported by tenderlovemaking (Aaron Patterson).

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Bug #17661: IO#each will segfault when if file is closed inside an `each_byte` block
https://bugs.ruby-lang.org/issues/17661

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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As reported here: https://twitter.com/asterite/status/1363487990203506689 when iterating through a file's contents with #each_byte, if the filehandle is closed inside of the block yielded to by #each byte, this condition is not detected, and a segmentation fault is thrown.

Repro:

```ruby
file = http://File.open(__FILE__)
file.each_byte do |byte|
  p byte
  file.close
end
```

Proposed fix is here: https://github.com/ruby/ruby/pull/4217



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