[Haskell-cafe] Access to list

Hi, If I define the follwoing functions: car (x:_) = x car [] = [] cdr (_:xs) = xs cdr [] = [] and try to apply them to some list, such as car [1,2,3] I get this odd error: <interactive>:1:9: No instance for (Num [a]) arising from the literal `3' at <interactive>:1:9 Possible fix: add an instance declaration for (Num [a]) In the expression: 3 In the first argument of `car', namely `[1, 2, 3]' In the expression: car [1, 2, 3] What am I doing wrong this time? :-P Thanks