Issue #14684 has been reported by RubyBugs (A Nonymous).

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Bug #14684: IRB swallows exceptions
https://bugs.ruby-lang.org/issues/14684

* Author: RubyBugs (A Nonymous)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.3.4p301 (2017-03-30 revision 58214) [x86_64-darwin15]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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# Summary

IRB swallows exceptions, doesn't provide programatic access to raised exception in session.

## Details

On Ruby 2.3.4, we find it surprising that exceptions in IRB are swallowed, and are not accessible at the two locations we checked:

1. In the global variable for most recent exception `$!`
2. In the return value of evaluating the expression `_`

Consider this IRB session:

~~~ ruby
def method_which_raises
  1/0
end

method_which_raises

# ZeroDivisionError: divided by 0
#	from (irb):10:in `/'
#	from (irb):10:in `method_which_raises'
#	from (irb):13
#	from /Users/marcsiegel/.rubies/ruby-2.3.4/bin/irb:11:in `<main>'
~~~

### Observed

Neither `_` nor `$!` give access to the raised exception, so that during development or debugging, one could dig further into what had occurred.

### Expected

Either `_` or `$!` would give programmatic access in IRB to an exception




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