Weird app error: uninitialized fiber (FiberError)

["Lin Jen-Shin (godfat)" <godfat-hOE/xeEBYYIdnm+yROfE0A@public.gmane.org>]

Hello Rainbows,

I was trying to `use :CoolioFiberSpawn` with `Rainbows.sleep`
to simulate asynchrony HTTP requests. However, I keep seeing
weird "app error: uninitialized fiber (FiberError)".

I spent a few hours (ouch) tracking down to a simple case.
Suppose I have a Rack app which has `Rainbows.sleep`
inside a each block:
https://gist.github.com/1536857 (I am running Ruby 1.9.3)

class Weird
  def call env=nil
    [1].each{ # if you comment out the each block, then it works
      Rainbows.sleep 2
    }
    [200, {}, ["ok\n"]]
  end
end

Then `run Weird.new` would always cause

    app error: uninitialized fiber (FiberError)

But if I took out the each block
inside Weird#call, such like:

class Weird
  def call env=nil
    Rainbows.sleep 2
    [200, {}, ["ok\n"]]
  end
end

Then it works fine. Moreover, if I run the app like this:

    run lambda{ |env| Weird.new.call }

Then both with or without the each block would work.

Could you please explain this for me? Or is it a bug somewhere?
Thanks!!
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