[ruby-core:86989] [Ruby trunk Bug#14749] IRB: `_` is not updated after exception raised

Issue #14749 has been reported by no6v (Nobuhiro IMAI).

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Bug #14749: IRB: `_` is not updated after exception raised
https://bugs.ruby-lang.org/issues/14749

* Author: no6v (Nobuhiro IMAI)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0dev (2018-05-10 trunk 63393) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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After r63150, once exception raised, irb holds that exception to `_` instead of the last evaluated value.

~~~irb
$ irb -f
irb(main):001:0> RUBY_VERSION
=> "2.6.0"
irb(main):002:0> _
=> "2.6.0"
irb(main):003:0> raise RUBY_RELEASE_DATE
Traceback (most recent call last):
(snip)
        1: from (irb):3
RuntimeError (2018-05-10)
irb(main):004:0> _
=> #<RuntimeError: 2018-05-10>
irb(main):005:0> RUBY_REVISION
=> 63393
irb(main):006:0> _
=> #<RuntimeError: 2018-05-10>
~~~

The last result of above example should be 63393.
The following patch works fine for me, but I'm not sure it is enough or not.

~~~diff
diff --git a/lib/irb.rb b/lib/irb.rb
index 98bcac016d..a10f9e894a 100644
--- a/lib/irb.rb
+++ b/lib/irb.rb
@@ -501,6 +501,8 @@ def eval_input
           if exc
             last_error = exc
             handle_exception(exc)
+          else
+            last_error = nil
           end
         end
       end
~~~




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