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

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