Wills, Trusts, and Estates
Under the no reformation rule, courts cannot correct mistakes in wills. They will follow what the will says even if it is not what the testator wanted.
Despite still following this rule, modern courts often try to construe things as ambiguities to allow them to fix mistakes.
Then some modern courts, like California, will not follow the no reformation rule, and will just do whatever they think is the best if there is clear and convincing evidence of a mistake.