Issue #13120 has been updated by Nobuyoshi Nakada.

Status changed from Closed to Open
Backport changed from 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN to 2.2: DONTNEED, 2.3: DONTNEED, 2.4: REQUIRED

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Bug #13120: p [].class shows ThreadSafe::Array when it expects to show Array
https://bugs.ruby-lang.org/issues/13120#change-62457

* Author: Yasuo Honda
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0dev (2017-01-10 trunk 57299) [x86_64-linux]
* Backport: 2.2: DONTNEED, 2.3: DONTNEED, 2.4: REQUIRED
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It has been filed as Rails issue https://github.com/rails/rails/issues/27631 and found there was a similar bug reported https://bugs.ruby-lang.org/issues/11977 . It looks it reproduces again.

Steps to reproduce:

```
$ ruby -v
ruby 2.5.0dev (2017-01-10 trunk 57299) [x86_64-linux]
$ bundle -v
Bundler version 1.13.7
$ git clone -b ruby250 https://github.com/yahonda/array_bug.git
$ cd array_bug
$ bundle
$ bundle exec ruby -w -e 'p [].class'
Array
$ bundle exec ruby -w -e 'require "rails"; p [].class'
ThreadSafe::Array
```





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