Hello,
I believe that this is maybe not a *feature* but at least expected
behaviour.
The call formals(args(`[`)) breaks down to
> args(`[`)
NULL
> formals(NULL)
NULL
Warning message:
In formals(fun) : argument is not a function
Hope this helps,
Rui Barradas
Às 18:26 de 06/10/2018, Laurent Gautier escreveu:
Hi,
A short code example showing the warning might the only thing needed here:
```
formals(args(`[`))
NULL
*Warning message:In formals(fun) : argument is not a function*
is.function(`[`)
[1] TRUE
is.primitive(`[`)
[1] TRUE
```
Now with an other primitive:
```
formals(args(`sum`))
$...
$na.rm
[1] FALSE
is.function(`sum`)
[1] TRUE
is.primitive(`sum`)
[1] TRUE
class(`[`)
[1] "function"
```
Is this a feature ?
Laurent
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