Rubinius: FFI::Function doesn't return break value

callback.c

typedef void (callback_fn) (void);

void
call_callback(callback_fn *callback)
{
	(* callback)();
}

Makefile

libcallback.dylib: callback.c
	clang -dynamiclib -std=gnu99 callback.c -o $@

rbx_ffi-callback_break_value.rb

require 'minitest/autorun'
require 'ffi'

module LibCallback
  extend ::FFI::Library

  lib_name = 'libcallback'
  ffi_lib "#{lib_name}.#{::FFI::Platform::LIBSUFFIX}"

  attach_function :call_callback, [:pointer], :void, blocking: true
end


describe FFI::Function do
  def foo
    ret = nil
    callback = FFI::Function.new(:void, [], blocking: true) do
      ret = yield
    end
    LibCallback.call_callback(callback)
    ret
  end

  it "returns block value" do
    assert_equal :value, foo { :value }
  end

  describe "with breaking block" do
    # NOTE: This is the one that fails on Rubinius 2.5.8
    it "returns break value" do
      assert_equal :value, foo { break :value }
    end
  end
end

describe "pure Ruby block" do
  def foo
    yield
  end

  it "returns block value" do
    assert_equal :value, foo { :value }
  end

  describe "with breaking block" do
    it "returns break value" do
      assert_equal :value, foo { break :value }
    end
  end
end

__END__

##
# EXPECTED, as when run on Ruby 2.2.4 or JRuby 9.0.0.0
Run options: --seed 7697

# Running:

....

Finished in 0.001665s, 2402.1095 runs/s, 2402.1095 assertions/s.

4 runs, 4 assertions, 0 failures, 0 errors, 0 skips



##
# ACTUAL, when run on Rubinius 2.5.8
Run options: --seed 6069

# Running tests:

.F..

Finished tests in 0.077881s, 51.3604 tests/s, 51.3604 assertions/s.

  1) Failure:
FFI::Function::with breaking block#test_0001_returns break value [/Users/paddor/src/ruby/cztop/rbx_ffi-callback_break_value/rbx_ffi-callback_break_value.rb:30]:
Expected: :value
  Actual: nil

4 tests, 4 assertions, 1 failures, 0 errors, 0 skips