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#' Convert a possible symbol to character.
#'
#' @param symbol A `symbol` or `character` (of length one).
#'
#' @return A `character` representation of the input.
#'
#' @md
#' @noRd
symbol_as_character <- function(symbol)
{
if (is.symbol(symbol) ||
(is.character(symbol) && length(symbol) == 1L)) {
as.character(symbol)
} else {
stop(sprintf("%s is not a valid symbol.",
paste(as.character(symbol), collapse = " ")),
call. = FALSE)
}
}
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