[ruby-core:93982] [Ruby master Bug#15558] Should Exception#exception copy the backtrace?

Issue #15558 has been updated by ko1 (Koichi Sasada).


I'm not sure the intention, but


Japanese document shows how to use it:

```
# http://rurema.clear-code.com/2.6.0/method/Exception/i/exception.html
begin
 ...        # do something
rescue => e
 raise e.exception("an error occurs during hogehoge process")  # detailed message
end
```

If this method is intended to be raised immediately, the empty backtrace is reasonable.

----------------------------------------
Bug #15558: Should Exception#exception copy the backtrace?
https://bugs.ruby-lang.org/issues/15558#change-80175

* Author: Eregon (Benoit Daloze)
* Status: Open
* Priority: Normal
* Assignee: Eregon (Benoit Daloze)
* Target version: 
* ruby -v: ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-linux]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Currently it does not on MRI:
```
ruby -e 'begin raise "foo"; rescue => e; c=e.exception "bar"; p c.backtrace; end'
nil
```

But it does on JRuby 9.2.5.0 and TruffleRuby 1.0.0-rc11:
```
truffleruby -e 'begin raise "foo"; rescue => e; c=e.exception "bar"; p e.backtrace; end'
["-e:1:in `<main>'"]
```

This means in some cases, code needs about this difference such as in
https://github.com/asciidoctor/asciidoctor/blob/41da20a47a8da96966ef3ec1c2f509e07e7920e3/lib/asciidoctor.rb#L1322-L1338
More context in:
https://github.com/oracle/truffleruby/issues/1542#issuecomment-456850066



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