expected <- eval(parse(text="FALSE"));          
test(id=0, code={          
argv <- eval(parse(text="list(structure(list(`character(0)` = structure(integer(0), .Label = character(0), class = \"factor\")), .Names = \"character(0)\", row.names = character(0), class = \"data.frame\"))"));          
do.call(`is.integer`, argv);          
}, o=expected);          

