[ruby-core:101529] [Ruby master Misc#17407] Fiber.current and require 'fiber'

Issue #17407 has been reported by zverok (Victor Shepelev).

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Misc #17407: Fiber.current and require 'fiber'
https://bugs.ruby-lang.org/issues/17407

* Author: zverok (Victor Shepelev)
* Status: Open
* Priority: Normal
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Maybe it is not the right time to ask, but why one need to do `require 'fiber'` before using `Fiber.current`?

For what I can see, 
* it is this way since [their introduction](https://docs.ruby-lang.org/en/2.0.0/Fiber.html#method-c-current), 
* the actual code is defined in the core [cont.c](https://github.com/ruby/ruby/blob/master/cont.c#L2480)
* the `ext/fiber.c` [does very little](https://github.com/ruby/ruby/blob/master/ext/fiber/fiber.c)

I was just bitten by it again preparing the changelog (stuck with `NoMethodError` and for a few minutes thought the build is broken), is there a reason to have it this way?..
Just clarifying for docs sake, at least.



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