Nothing
setGeneric("clone", function(x, ...) standardGeneric("clone"))
setMethod("clone", "ANY", function(x, ...) x)
setMethod("clone", "CURLHandle", function(x, ...) dupCurlHandle(x, ...))
setMethod("clone", "environment",
function(x, ...) {
e = new.env(parent = parent.env(x))
sapply(ls(x, all.names = TRUE),
function(id)
assign(id, get(id, x), e))
e
})
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