[External] exists, get and get0 accept silently inputs of length > 1
Thanks for the suggestion. In R-devel (as of r79474) exists(), get(), and get0() now signal an error if the first argument has length > 1. This will cause about 30 CRAN packages and possibly a couple of Bioconductor packages to fail under R-devel. getS3method() now also signals an error if the class argument has length > 1. Calls of the form getS2method(generic, class(x)) will now fail if class(x) has length > 1. I believe most CRAN package issues related to this change have already been resolved, but a few may remain. Best, luke
On Fri, 13 Nov 2020, Antoine Fabri wrote:
Dear R-devel,
The doc of exists, get and get0 is unambiguous, x should be an object given
as a character string. However these accept longer inputs. It can lead an
uncareful user to think these functions are vectorized when they're not,
and generally lets through bugs that one might have preferred to trigger
earlier failure.
``` r
exists("d")
#> [1] FALSE
exists(c("c", "d"))
#> [1] TRUE
get(c("c", "d"))
#> function (...) .Primitive("c")
get0(c("c", "d"))
#> function (...) .Primitive("c")
```
I believe these should either fail, or be vectorized, probably the former.
Thanks,
Antoine
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