[Rd] capture "->"

[Dmitri Popavenko]

Dear Duncan,

On Fri, Mar 1, 2024 at 11:30 AM Duncan Murdoch <murdoch.duncan using gmail.com>
wrote:

> ...
> If you parse it with srcrefs, you could look at the source.  The parser
> doesn't record whether it was A -> B or B <- A anywhere else.
>

Thank you, this gets me closer but it still needs a little push:

> foo <- function(x) {
  x <- substitute(x)
  return(attr(x, "srcref")[[2]])
}

> foo(A -> B)
NULL

This seems to work, however:
> foo({A -> B})
A -> B

Is there a way to treat the formula as if it was enclosed between the curly
brackets?
Dmitri

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