Issue #14240 has been reported by akr (Akira Tanaka).

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Bug #14240: warn four special variables: $; $, $/ $\
https://bugs.ruby-lang.org/issues/14240

* Author: akr (Akira Tanaka)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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I think the four special variables for separators should be deprecated.

```
$/    input record separator (default argument for "gets")
$\    output record separator ("print" prints it at last)
$,    default separator for Array#join and print
$;    default separator for String#split
```

I feel many program doesn't work if they are set to non-default value.

Since they are global, not thread local,
we can not change these variables safely in a multi threaded program.

So, I think we should warn them (and delete them in future).







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