[ruby-core:62984] [ruby-trunk - Feature #9918] [Open] Exception#cause should be shown in output and #inspect

Issue #9918 has been reported by Benoit Daloze.

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

* Author: Benoit Daloze
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: current: 2.2.0
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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:

    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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