Here's a self-contained example of the problem:
> foo <- function(obj) {return(3);}
> setGeneric("foo")
[1] "foo"
> removeGeneric("foo")
[1] TRUE
> foo <- function(x) {return(4);}
> args(foo)
function (x)
NULL
> setGeneric("foo")
[1] "foo"
> args(foo)
function (obj)
NULL
R 2.7.1. I get the same behavior whether or not I use ESS.
The reason this is more than a theoretical problem:
> setMethod("foo", signature(x="numeric"), function(x) {return(x+4);})
Error in match.call(fun, fcall) : unused argument(s) (x = "numeric")
Ross
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