Nothing
user_hints <- new.env(parent = emptyenv())
user_hints$l <- list()
#' Save a hint to the user during package load
#'
#' @param x [character] the hint
#'
#' @return `invisible(NULL)`
util_user_hint <- function(x) {
util_expect_scalar(x, check_type = is.character)
user_hints$l <-
c(user_hints$l, x)
}
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