expected <- eval(parse(text="quote(Employed ~ GNP.deflator + GNP + Unemployed + Armed.Forces + Population + Year)"));        
test(id=0, code={        
argv <- eval(parse(text="list(structure(list(Employed = c(60.323, 61.122, 60.171, 61.187, 63.221, 63.639, 64.989, 63.761, 66.019, 67.857, 68.169, 66.513, 68.655, 69.564, 69.331, 70.551), GNP.deflator = c(83, 88.5, 88.2, 89.5, 96.2, 98.1, 99, 100, 101.2, 104.6, 108.4, 110.8, 112.6, 114.2, 115.7, 116.9), GNP = c(234.289, 259.426, 258.054, 284.599, 328.975, 346.999, 365.385, 363.112, 397.469, 419.18, 442.769, 444.546, 482.704, 502.601, 518.173, 554.894), Unemployed = c(235.6, 232.5, 368.2, 335.1, 209.9, 193.2, 187, 357.8, 290.4, 282.2, 293.6, 468.1, 381.3, 393.1, 480.6, 400.7), Armed.Forces = c(159, 145.6, 161.6, 165, 309.9, 359.4, 354.7, 335, 304.8, 285.7, 279.8, 263.7, 255.2, 251.4, 257.2, 282.7), Population = c(107.608, 108.632, 109.773, 110.929, 112.075, 113.27, 115.094, 116.219, 117.388, 118.734, 120.445, 121.95, 123.366, 125.368, 127.852, 130.081), Year = 1947:1962), .Names = c(\"Employed\", \"GNP.deflator\", \"GNP\", \"Unemployed\", \"Armed.Forces\", \"Population\", \"Year\"), terms = quote(Employed ~ GNP.deflator + GNP + Unemployed +     Armed.Forces + Population + Year), row.names = 1947:1962, class = \"data.frame\"), \"terms\")"));        
do.call(`attr`, argv);        
}, o=expected);        

