[Rd] A fix that for 'bquote' that may work (PR#14031)

[suharto_anggono at yahoo.com]

This is a fix for 'bquote' that may work.

function (expr, where =3D parent.frame())=20
{
    unquote <- function(e) {
        if (length(e) <=3D 1 || !is.language(e))=20
            e
        else if (e[[1]] =3D=3D as.name("."))=20
            eval(e[[2]], where)
        else as.call(lapply(e, unquote))
    }
    unquote(substitute(expr))
}
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