Nothing
`%??%` <- function(lhs, rhs) {
if (is_empty(lhs)) rhs else lhs
}
is_empty <- function(x) {
length(x) == 0
}
is_string <- function(x) {
length(x) == 1 && is.character(x)
}
opposite <- function(f) {
formals(f) <- rev(formals(f))
f
}
`%encloses%` <- function(parent, bindings) {
list2env(bindings, parent = parent)
}
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