§ 4. Applicability. This chapter applies to (a) every corporation heretofore or hereafter formed under this chapter, or under any other general statute or special act of this state, which would, if it were to be formed currently under the laws of this state, be formed under this chapter, and (b) every corporation formed under laws other than the statutes of this state to the extent provided in section five and section seventy-six of this chapter.