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

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))
}

If you want to use bquote() on function definitions a better fix is

bquote <- function (expr, where = parent.frame())
{
     unquote <- function(e) {
         if (length(e) <= 1)
             e
         else if (e[[1]] == as.name("."))
             eval(e[[2]], where)
         else if (is.pairlist(e)){
             as.pairlist(lapply(e,unquote))
         }
         else as.call(lapply(e, unquote))
     }
     unquote(substitute(expr))
}

since that now allows substitution into default arguments, eg
   default<-1
   g<-b2quote(function(x,y=.(default)) x+y )



         -thomas

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle