Issue #11969 has been updated by Tomoyuki Chikanaga.

Backport changed from 2.1: DONE, 2.2: REQUIRED, 2.3: REQUIRED to 2.1: DONE, 2.2: DONE, 2.3: REQUIRED

Backported into `ruby_2_2` branch at r54322.

----------------------------------------
Bug #11969: [PATCH] IRB: Final newline missing in truncated backtraces
https://bugs.ruby-lang.org/issues/11969#change-57750

* Author: Stefan Daschek
* Status: Closed
* Priority: Normal
* Assignee: Keiju Ishitsuka
* ruby -v: 2.3.0
* Backport: 2.1: DONE, 2.2: DONE, 2.3: REQUIRED
----------------------------------------
If IRB shows a backtrace that gets truncated because of `back_trace_limit`, the last line of the backtrace does not end with a newline.

Steps to reproduce:

~~~
$ irb -f --back-trace-limit 1
irb(main):001:0> foo
~~~

Actual output:

~~~
NameError: undefined local variable or method `foo' for main:Object
Did you mean?  fork
	from (irb):1
	from /Users/stefan/.rbenv/versions/2.3.0/bin/irb:11:in `<main>'irb(main):002:0> 
~~~

Expected output:

~~~
NameError: undefined local variable or method `foo' for main:Object
Did you mean?  fork
	from (irb):1
	from /Users/stefan/.rbenv/versions/2.3.0/bin/irb:11:in `<main>'
irb(main):002:0> 
~~~

Tested with Ruby 2.3.0, but this seems to affect older versions as well. 



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