Issue #16281 has been reported by marcandre (Marc-Andre Lafortune).

----------------------------------------
Bug #16281: `irb -w` issues warning
https://bugs.ruby-lang.org/issues/16281

* Author: marcandre (Marc-Andre Lafortune)
* Status: Open
* Priority: Normal
* Assignee: aycabta (aycabta .)
* Target version: 2.7
* ruby -v: ruby 2.7.0dev (2019-10-25T17:56:12Z trunk 41d5294506) [x86_64-darwin18]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
```
$ irb -w
.rvm/rubies/ruby-head/lib/ruby/2.7.0/reline.rb:322: warning: instance variable @ambiguous_width not initialized
```

(Since f13db4adde532)



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