[ruby-core:90693] [CommonRuby Feature#15458] Automatic Exception#cause print in IRB

Issue #15458 has been reported by jnchito (Junichi Ito).

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Feature #15458: Automatic Exception#cause print in IRB
https://bugs.ruby-lang.org/issues/15458

* Author: jnchito (Junichi Ito)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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According to Ruby 2.6 NEWS, the following feature will be added:

> Print cause of the exception if the exception is not caught and printed its backtraces and error message [Feature #8257]

I expected it would be applied in IRB too, but it wasn't. Here is my example:

~~~
> begin
> 1/0
> rescue => e
> e.mesage
> end
Traceback (most recent call last):
        5: from /Users/jnito/.rbenv/versions/2.6.0-rc1/bin/irb:23:in `<main>'
        4: from /Users/jnito/.rbenv/versions/2.6.0-rc1/bin/irb:23:in `load'
        3: from /Users/jnito/.rbenv/versions/2.6.0-rc1/lib/ruby/gems/2.6.0/gems/irb-0.9.6/exe/irb:11:in `<top (required)>'
        2: from (irb):1
        1: from (irb):4:in `rescue in irb_binding'
NoMethodError (undefined method `mesage' for #<ZeroDivisionError: divided by 0>)
Did you mean?  message
~~~

On the other hand, when I run that code via ruby command, cause of the exception is automatically printed:

~~~
$ ruby sample.rb
Traceback (most recent call last):
	1: from sample.rb:2:in `<main>'
sample.rb:2:in `/': divided by 0 (ZeroDivisionError)
	1: from sample.rb:1:in `<main>'
sample.rb:4:in `rescue in <main>': undefined method `mesage' for #<ZeroDivisionError: divided by 0> (NoMethodError)
Did you mean?  message
~~~

I feel it would be more natural and useful if the new feature would work in IRB too.




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