Spurious warning when selecting vars with c()

[hadley]

library(tidyr)

df <- tibble::tibble(x = 1, y = 2, z = 3)
df %>% gather("key", "value", c(2, 3))
#> Warning in if (!is.finite(x)) return(FALSE): the condition has length > 1
#> and only the first element will be used
#> # A tibble: 2 x 3
#>       x   key value
#>   <dbl> <chr> <dbl>
#> 1     1     y     2
#> 2     1     z     3
df %>% gather("key", "value", 2:3)
#> # A tibble: 2 x 3
#>       x   key value
#>   <dbl> <chr> <dbl>
#> 1     1     y     2
#> 2     1     z     3

From tidyverse/tidyr#374