fails:Fiber#resume can be invoked from the root Fiber
fails:Fiber#resume passes control to the beginning of the block on first invocation
fails:Fiber#resume returns the last value encountered on first invocation
fails:Fiber#resume runs until the end of the block
fails:Fiber#resume runs until Fiber.yield
fails:Fiber#resume resumes from the last call to Fiber.yield on subsequent invocations
fails:Fiber#resume accepts any number of arguments
fails:Fiber#resume sets the block parameters to its arguments on the first invocation
fails:Fiber#resume raises a FiberError if the Fiber is dead
fails:Fiber#resume raises a LocalJumpError if the block includes a return statement
fails:Fiber#resume raises a LocalJumpError if the block includes a break statement
fails:Fiber#resume returns control to the calling Fiber if called from one
fails:Fiber#resume executes the ensure clause
