Issues with mruby 3.2.0

Hi,

I've found an issue with mruby 3.2.0.

Given these two files:

entry.rb

$:.unshift '.'

require 'zip'

and zip.rb

a = [1,2,3]
b = [:a, :b, :c]

p a.zip(b)

I am getting the error:

trace (most recent call last):
        [10] (unknown):0
        [9] (unknown):0:in require
        [8] /home/sean/Syncthing/code/c++/taylor/zip.rb:4
        [7] /home/sean/Syncthing/code/c++/taylor/zip.rb:4:in zip
        [6] /home/sean/Syncthing/code/c++/taylor/zip.rb:4:in each
        [5] /home/sean/Syncthing/code/c++/taylor/zip.rb:4:in zip
        [4] /home/sean/Syncthing/code/c++/taylor/zip.rb:4:in each
        [3] /home/sean/Syncthing/code/c++/taylor/zip.rb:4:in zip
        [2] /home/sean/Syncthing/code/c++/taylor/zip.rb:4:in next
        [1] /home/sean/Syncthing/code/c++/taylor/zip.rb:4:in next_values
/home/sean/Syncthing/code/c++/taylor/zip.rb:4:in resume: can't cross C function boundary (FiberError)

It works as expected with mruby 3.1.0

Please let me know if you require any more information

Reproduce the report using entry.rb and zip.rb with mruby 3.2.0, then compare the same case on mruby 3.1.0. Investigate the require and FiberError path exposed by Array#zip and determine what needs to change so the example works again on 3.2.0; done means the reported program runs without the boundary error.