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Description: - Choice was made to not add unused variables when there is no contract and no body (no pre/(x)post, and no body). - For postcondition variable result, we only check variables that are not of unit type. And, we report a warning only if the variable is not present in all the ensures. - For result variable, with several imbricated raise, it seems possible to have false positive with no location. Removing the no location case which seems unhelpful anyway
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