fiber-related crash after full GC

[kazuho]

The code snippet below crashes with assertion failure: (f->tt == MRB_TT_FIBER), function fiber_check, file /mydev/3p/mruby/mrbgems/mruby-fiber/src/fiber.c, line 140..

# create fiber
f = Fiber.new do
  me = Fiber.current
  Fiber.yield(
    Proc.new do
      me.resume
    end
  )
end

# obtain proc that refers to the fiber through env
f = f.resume

# GC
GC.start

# call the proc
f.call

[kazuho]

FWIW assertion failure disappears once the the expression that creates the proc into a separate method, like:

def create_resumer()
  me = Fiber.current
  Proc.new do
    me.resume
  end
end

# create fiber
f = Fiber.new do
  Fiber.yield(create_resumer())
end

# obtain proc that refers to the fiber through env
f = f.resume

# GC
GC.start

# call the proc
f.call

[kazuho]

Thank you for the fix!