Issue #12302 has been updated by Usaku NAKAMURA.

Backport changed from 2.1: REQUIRED, 2.2: REQUIRED, 2.3: DONE to 2.1: REQUIRED, 2.2: DONE, 2.3: DONE

ruby_2_2 r54769 merged revision(s) 54681.

----------------------------------------
Bug #12302: at_exit status status is changed by raising/rescueing a exception in at_exit
https://bugs.ruby-lang.org/issues/12302#change-58317

* Author: Michael Grosser
* Status: Closed
* Priority: Normal
* Assignee: Rei Odaira
* ruby -v: -
* Backport: 2.1: REQUIRED, 2.2: DONE, 2.3: DONE
----------------------------------------
~~~ruby
at_exit do
  puts "1 #{$!}"
end

at_exit do
  puts "2 #{$!}"
  raise 'x' rescue nil
end

at_exit do
  puts "3 #{$!}"
  exit 1
end
~~~

Nr 3 runs first and exits 1 ... Nr2 receives the correct exit status ... but using raise/rescue there overrides `$!` and Nr 1 thinks it is a clean exit ...

seems semi related to https://bugs.ruby-lang.org/issues/5218 ... ideally the `at_exit` block should restore the previous `$!` ... or give some other way of knowing the exit status like passing it to the block

~~~ruby
at_exit do |exception|
   ...
end
~~~



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