# from tidyr
col_name <-
function (x,
default = stop("Please supply column name", call. = FALSE))
{
if (is.character(x))
return(x)
if (identical(x, quote(expr = )))
return(default)
if (is.name(x))
return(as.character(x))
if (is.null(x))
return(x)
stop("Invalid column specification", call. = FALSE)
}
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