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[SirVer <SirVer@xxxxxx>]

>-Werror=return-type will treat just that warning as an error.

amendment for that: that is a really good thing (TM). Because should in a release build the execution really reach the code path without a return statement, the returned value will be random. This leads to undefined behavior down the path and really hard to debug crashes. 

If you want to signalize that a code path is unreachable, just throw an exception there. 


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