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if( some_return_value = some_function(
        some_variable, some_other_variable,
...
} else {
   // report or otherwise handle the error 
}

if( someRV = someFunc( some, someOther, yetMore, oneMore4, luck ) ) {
    // do some stuff here with some_return_value 
} else {
   // report or otherwise handle the error 
}