[ruby-core:113094] [Ruby master Bug#19441] Closing an Tempfile#dup behaviour

Issue #19441 has been updated by jeremyevans0 (Jeremy Evans).


I think this is a bug in `Tempfile#{dup,clone}` that we should fix.  I submitted a pull request for it: https://github.com/ruby/tempfile/pull/17

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Bug #19441: Closing an Tempfile#dup behaviour
https://bugs.ruby-lang.org/issues/19441#change-102631

* Author: stac47 (Laurent Stacul)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.2.1 (2023-02-08 revision 31819e82c8) [x86_64-darwin20]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN
----------------------------------------
Hello amazing ruby folks!

I classified that ticket as a "Bug" although it is perhaps something I did not understand.

Here is a ruby session:

``` ruby
irb(main):001:0> file = Tempfile.new
=> #<File:/var/folders/m2/bljzrgq160vbf0vk466k_7gw0000gn/T/20230216-39664-davfmj>
irb(main):002:0> file.fileno
=> 9
irb(main):003:0> dup = file.dup
=> #<File:/var/folders/m2/bljzrgq160vbf0vk466k_7gw0000gn/T/20230216-39664-davfmj>
irb(main):004:0> dup.fileno
=> 10
irb(main):005:0> dup.close
=> nil
irb(main):006:0> dup.closed?
=> false
irb(main):007:0> file.closed?
=> true
```

The two last lines are unexpected to me. I would have expected the converse:

```ruby
irb(main):006:0> dup.closed?
=> true
irb(main):007:0> file.closed?
=> false
```

I tried this scenario in latest ruby but also in ruby 2.7.

Thanks in advance for helping me to understand this behaviour.



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