Issue #12302 has been reported by Michael Grosser.

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

* Author: Michael Grosser
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
~~~
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 $1 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

~~~
at_exit do |exception}
   ...
end
~~~



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