From: shyouhei@...
Date: 2017-06-13T16:06:29+00:00
Subject: [ruby-core:81665] [Ruby trunk Bug#13655] external encoding named "-" (doc issue or…?)

Issue #13655 has been reported by shyouhei (Shyouhei Urabe).

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Bug #13655: external encoding named "-" (doc issue or���?)
https://bugs.ruby-lang.org/issues/13655

* Author: shyouhei (Shyouhei Urabe)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 2.5
* ruby -v: ruby 2.5.0dev (2017-06-09 trunk 59055) [x86_64-darwin15]
* Backport: 2.2: REQUIRED, 2.3: REQUIRED, 2.4: REQUIRED
----------------------------------------
IO.new's document explicitly states that it accepts "-" as external encoding:

https://github.com/ruby/ruby/blob/d0015e4ac6b812ea1681b1f5fa86fbab52a58960/io.c#L7790

which is not true.

```
% ruby -ve 'IO.new(0, external_encoding: "-")'
ruby 2.5.0dev (2017-06-09 trunk 59055) [x86_64-darwin15]
Traceback (most recent call last):
        2: from -e:1:in `<main>'
        1: from -e:1:in `new'
-e:1:in `initialize': unknown encoding name - - (ArgumentError)
```



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