[Rd] sys.call() 's srcref doesn't match the language

[Antoine Fabri]

Thanks Lionel,

I now understand what's going on. I like your proposal and I can confirm I
wouldn't have been confused had it be printed this way.

In fact I wouldn't mind the file:line:column to be displayed every time.

Best,

Antoine



Le jeu. 3 sept. 2020 à 00:19, Lionel Henry <lionel using rstudio.com> a écrit :

> Hello,
>
> The source references are useful for debugging tools because they
> allow linking to call sites in the source files.
>
> I agree the output can be confusing. Perhaps this could be fixed by
> tweaking the print method for calls. If the deparsed call doesn't
> match the srcref, both could be displayed along with file:line:column.
>
> ```
> #> f()
> #> <srcref:file.R:2:3>
> #> 1 + f()
> ```
>
> Best,
> Lionel
>
>
> On 9/2/20, Antoine Fabri <antoine.fabri using gmail.com> wrote:
> > Dear R-devel,
> >
> > I found this behavior disturbing, if `1 + f()` is called, `sys.call()`
> > called inside of `f` will return a quoted `f()` with a "srcref" that
> prints
> > "1 + f()".
> >
> > I don't know which one is good but I don't think they can be correct at
> the
> > same time.
> >
> > Here's a reproducible example:
> >
> > f <- function(){
> >   sc <- sys.call()
> >   print(sc)
> >   attr(sc, "srcref") <- NULL
> >   print(sc)
> >   1
> > }
> > f2 <- function() {
> >   1 + f()
> > }
> > f()
> > #> f()
> > #> f()
> > #> [1] 1
> > f2()
> > #> 1 + f()
> > #> f()
> > #> [1] 2
> >
> > Best,
> >
> > Antoine
> >
> >       [[alternative HTML version deleted]]
> >
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> > https://stat.ethz.ch/mailman/listinfo/r-devel
> >
>

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