The underlying purpose of the functus doctrine is to “allow finality of judgments from courts which are subject to appeal.” If such courts could continually alter their decisions, they “would assume the function of an appellate court and deny litigants a stable base from which to launch an appeal”: Doucet-Boudreau v. Nova Scotia (Minister of Education), 2003 S.C.R. 3, at para. 79. Thus, where a “trial judge does not purport to alter a final judgment,” the doctrine does not apply: Doucet-Boudreau v. Nova Scotia, at para. 76.
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