can't catch throw

[Nakilon]

require "maxitest/autorun"
describe "" do
  around do |test|
    catch(:_){ test.call }
  end
  it do
    throw :_
  end
end

UncaughtThrowError: uncaught throw :_

[grosser]

FYI reproduction grosser/maxitest#56

yeah this is tricky ... we abused fibers to get around to work and they don't support throw/catch
ideas welcome ... maybe around just needs a rework (ideally live in minitest directly)