### =========================================================================
### utilities for defining the package
### -------------------------------------------------------------------------
###
make_do <- function(fun) {
args <- formals(fun)
args[] <- lapply(names(args), as.name)
as.function(c(formals(fun),
call("eval", as.call(c(substitute(fun), args)))))
}
globalVariables(c("count", # output subset() expression
"len" # output within() expression
))
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