Issue #11787 has been reported by Shugo Maeda.

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Bug #11787: rb_inspect() should check Encoding.default_internal instead of Encoding.default_external
https://bugs.ruby-lang.org/issues/11787

* Author: Shugo Maeda
* Status: Open
* Priority: Normal
* Assignee: Yui NARUSE
* ruby -v: 
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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rb_inspect() checks Encoding.default_external even if Encoding.default_internal is specified.

```
$ cat t.rb
puts "\u3042"
p "\u3042"
$ ruby -E windows-31j:utf-8 t.rb
дв
t.rb:2:in `p': inspected result must be ASCII only or use the default external encoding (Encoding::CompatibilityError)
	from t/t.rb:2:in `<main>'
```

Encoding.default_internal should be check instead.




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