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#' Tidy eval helpers
#'
#' @description
#'
#' * \code{\link[rlang]{sym}()} creates a symbol from a string and
#' \code{\link[rlang:sym]{syms}()} creates a list of symbols from a
#' character vector.
#'
#' * \code{\link[rlang:nse-defuse]{enquo}()} and
#' \code{\link[rlang:nse-defuse]{enquos}()} delay the execution of one or
#' several function arguments. \code{enquo()} returns a single quoted
#' expression, which is like a blueprint for the delayed computation.
#' \code{enquos()} returns a list of such quoted expressions.
#'
#' * \code{\link[rlang:nse-defuse]{expr}()} quotes a new expression _locally_. It
#' is mostly useful to build new expressions around arguments
#' captured with [enquo()] or [enquos()]:
#' \code{expr(mean(!!enquo(arg), na.rm = TRUE))}.
#'
#' To learn more about tidy eval and how to use these tools, visit
#' \url{https://tidyeval.tidyverse.org} and the
#' \href{https://adv-r.hadley.nz/metaprogramming.html}{Metaprogramming
#' section} of \href{https://adv-r.hadley.nz}{Advanced R}.
#'
#' @md
#' @name tidyeval
#' @keywords internal
#' @aliases quo quos enquo enquos quo_name
#' sym ensym syms ensyms
#' expr exprs enexpr enexprs
#' .data
#' @export quo quos enquo enquos quo_name
#' @export sym ensym syms ensyms
#' @export expr enexpr enexprs
#' @export .data
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