Issue #10344 has been updated by decuplet (Nikita Shilnikov).


Shortly after I started to work on a library implementing algebraic effects (https://github.com/dry-rb/dry-effects) I stumbled upon lack of `Fiber#raise`. From the user POV it is important to signal improper use of effects with a meaningful stacktrace so they can quickly detect what's wrong. It's possible to emulate `#raise` with checks but it's quite inefficient and seems redundant. Thank you all folks for discussing and working on this, I hope it'll land in 2.7. If you're interested I can show a clear example but the task is almost identical to @ioquatix's one.

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Feature #10344: [PATCH] Implement Fiber#raise
https://bugs.ruby-lang.org/issues/10344#change-78254

* Author: nome (Knut Franke)
* Status: Closed
* Priority: Normal
* Assignee: ioquatix (Samuel Williams)
* Target version: 2.7
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While it is possible to implement this in pure Ruby (by wrapping Fiber.yield and Fiber#resume), this feels like a low-level feature that ought to be provided out of the box. Also, the C implementation is more straight-forward, and more efficient. Unfortunately, it is not quite possible to implement this as a C extension module (without resorting to wrappers again); cf. the change to make_passing_arg().

Example usage:

~~~
fib = Fiber.new do
  counter = 0
  loop { counter += Fiber.yield }
  counter
end
fib.resume
fib.resume 10
fib.resume 100
fib.raise StopIteration # => 110
~~~

---Files--------------------------------
0001-Implement-Fiber-raise.patch (4.12 KB)
0001-Implement-Fiber-raise.patch (3.51 KB)
0001-Implement-Fiber-raise-in-ext-fiber.patch (3.6 KB)


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