Nothing
subbars <-
function (term)
{
if (is.name(term) || !is.language(term))
return(term)
if (length(term) == 2) {
term[[2]] <- subbars(term[[2]])
return(term)
}
stopifnot(length(term) >= 3)
if (is.call(term) && term[[1]] == as.name("|"))
term[[1]] <- as.name("+")
for (j in 2:length(term)) term[[j]] <- subbars(term[[j]])
term
}
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