fails:Fiber#transfer can be invoked from the root Fiber
fails:Fiber#transfer passes control to the beginning of the block on first invocation
fails:Fiber#transfer returns the last value encountered on first invocation
fails:Fiber#transfer resumes from the last call to Fiber.yield on subsequent invocations
fails:Fiber#transfer sets the block parameters to its arguments on the first invocation
critical(hangs):Fiber#transfer can be invoked from the same Fiber it transfers control to
critical(hangs):Fiber#transfer raises a FiberError when transferring to a Fiber which resumes itself
fails:Fiber#transfer can transfer control to a Fiber that has transfered to another Fiber
fails:Fiber#transfer accepts any number of arguments
unstable(intermittent):Fiber#transfer raises a LocalJumpError if the block includes a return statement
