How to debug a generic function?

[Agin.Patrick@hydro.qc.ca]

Dear all,

 

Is there a way to debug a simple generic function? Mine (say plot.foo) has the form:

 

function(x,...)

UseMethod("plot")

 

I would like to inspect my code but enter is forbidden ("UseMethod is a primitive; cannot enter"). Is there a way to do it better than inspect(plot.foo) directly?

I have the same problem with do.call("plot.foo").

 

Thanks a lot,

Patrick