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Kim Nguyễn authored
when a type such as type t('a) = (Int,'a) is introduced, the variables occuring in the definitions are replaced by fresh occurences. The variables in the left-hand-side were note renamed accordingly, yielding a type definition: type t('a_0) = (Int, 'a_1) when performing type substitutions, none of the occurences of 'a_1 were replaced.
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