[ruby-core:69957] [Ruby trunk - Feature #9918] Exception#cause should be shown in output and #inspect

Issue #9918 has been updated by Nobuyoshi Nakada.

Description updated

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Feature #9918: Exception#cause should be shown in output and #inspect
https://bugs.ruby-lang.org/issues/9918#change-53387

* Author: Benoit Daloze
* Status: Open
* Priority: Normal
* Assignee: 
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Exception#cause has been added in Feature #8257.
But the cause is never shown, one needs to inspect exc.cause to know the cause.

The cause should be shown by default, for instance:

~~~ruby
begin
  raise "cause"
rescue
  raise "wrapper"
end
~~~

Should output:

    -:4:in `rescue in <main>': wrapper (RuntimeError)
           from -:1:in `<main>'
    Caused by:
    -e:1:in `<main>': org (RuntimeError)

And not only the first 2 lines.
Logically, #inspect should also include the cause such as:

    #<RuntimeError: wrapper cause:#<RuntimeError: org>>

What do you think?



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