[ruby-core:79937] [Ruby trunk Bug#13270] IRB hangs when printing "\e]"

Issue #13270 has been updated by Kazuhiro NISHIYAMA.


I can reproduce `print "\e]"` and Ctrl+C, nothing happens. But I can't reproduce using `puts "\e["`. And I can't reproduce Ctrl+D `prints "30m"`. Ctrl+D causes simply exited.

I think iTerm eats output from "\e]" (OSC) to "\a" (BEL) (or "\e" or something else).

`pry` outputs some `"\e"`s after evaluation, then it seems to be without hang.

I typed `print "\e]"`, Enter, Ctrl+C, `puts "\a"` (can't see), Enter. Then it outputs `=> nil` and prompt.

```
% rbenv exec irb -r irb/completion --simple-prompt
>> print "\e]"

=> nil
>>
```

----------------------------------------
Bug #13270: IRB hangs when printing "\e]"
https://bugs.ruby-lang.org/issues/13270#change-63363

* Author: Dorian M
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
Steps to reproduce:

- `irb`
- `print "\e]"`
- Or: `puts "\e["`
- try CMD+C, nothing happens
- try CMD+D, prints "30m"

Expected behavior:

- just prints "30m" (that's what `pry` does)

Ruby versions tried:

- ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin16]
- ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16]



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