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#' Tidy eval helpers
#'
#' @description
#'
#' * [rlang::sym()] creates a symbol from a string and
#' [rlang::syms()] creates a list of symbols from a
#' character vector.
#'
#' * [rlang::expr()] and [rlang::quo()] quote
#' one expression. `quo()` wraps the quoted expression in a quosure.
#'
#' The plural variants [rlang::exprs()] and
#' [rlang::quos()] return a list of quoted expressions or
#' quosures.
#'
#' * [rlang::enexpr()] and [rlang::enquo()]
#' capture the expression supplied as argument by the user of the
#' current function (`enquo()` wraps this expression in a quosure).
#'
#' [rlang::enexprs()] and [rlang::enquos()]
#' capture multiple expressions supplied as arguments, including
#' `...`.
#'
#' `exprs()` is not exported to avoid conflicts with `Biobase::exprs()`,
#' therefore one should always use `rlang::exprs()`.
#'
#' To learn more about tidy eval and how to use these tools, visit
#' <https://rlang.r-lib.org/> and the [Metaprogramming
#' section](https://adv-r.hadley.nz/metaprogramming.html) of [Advanced
#' R](https://adv-r.hadley.nz).
#'
#' @name tidyeval
#' @keywords internal
#' @importFrom rlang quo quos enquo enquos quo_name sym ensym syms
#' ensyms expr exprs enexpr enexprs .data :=
#' @aliases quo quos enquo enquos quo_name
#' sym ensym syms ensyms
#' expr exprs enexpr enexprs
#' .data :=
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