Tan Cheng Bock v AG [2017] SGCA 50 communities to which the persons holding the terms of office belonged. This cuts against, and must displace, the provisional and presumptive position arrived at above (see [59] above) that the first term should be one after the appointed date. Art 164 clearly contemplates that Parliament may choose a term of office that commenced either before or after 1 April 2017 as the first term. If it chooses a term of office after the appointed date, nothing further needs to be done. However, if it chooses a term of office before the appointed date, then under Art 164(1)(b), in relation to any of the terms that are counted before the appointed date, the communities to which the persons “who held those terms of office” [emphasis added] belong must also be specified. In the face of such clear and specific provisions, we can only conclude that the presumptive position earlier discussed cannot stand – it must be possible for Parliament to designate terms of the office of the President which were held before the appointed date, or else Art 164(1)(b) would be senseless and unnecessary. 66 That does not mean that Art 19B operates retrospectively in the strict sense. There is a distinction between legislating to alter or affect matters in the past and legislating to provide for the future consequences of past events: see Craies on Legislation (Daniel Greenberg gen ed) (Sweet & Maxwell, 10th Ed, 2012) at paras 10.3.5–10.3.6. The former is clearly retrospective legislation. The scheme provided for under Arts 19B and 164 comes under the latter category. This is an instance of legislation allowing future action to be potentially influenced by past events. 67 In this light, we are driven to reconsider another aspect of the presumptive position that we preliminarily arrived at, namely that the expression “office of President” when used on each of the three occasions in Art 19B(1) means the same thing, which is the office of President under the Constitution as it stands today after the 2016 Amendment. 36

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