Issue #10548 has been reported by Masaya Tarui.

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Feature #10548: Callcc is now going obsoleted.  Please use Fiber.
https://bugs.ruby-lang.org/issues/10548

* Author: Masaya Tarui
* Status: Open
* Priority: Normal
* Assignee: 
* Category: 
* Target version: 
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We are paying a lot of costs for callcc's consistency.
and currently, we can use Fiber in many situation.

In https://bugs.ruby-lang.org/projects/ruby/wiki/DevelopersMeeting20140517Japan,
matz agreed to remove callcc.

If there is no refutation, remove callcc in the future version. 



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