WARN9-Var parameters that are used, but never set
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Var parameters that are used, but never set (WARN9)
This is a list of all var parameters that are used but never set in the subprogram they belong to. Although this is not an error, it may be an indication that something is wrong with your code. Otherwise, you may omit the var keyword, or change it to a const parameter.
Parameters to event handlers are not reported.