should [[i, ]] be an error?

[jennybc]

Shouldn't [[i, ]] be an error?

library(tibble)
iris[[ , 1]]
#> Error in `[[.data.frame`(iris, , 1): argument "..1" is missing, with no default
iris[[1, ]]
#> Error in `[[.data.frame`(iris, 1, ): argument "..2" is missing, with no default
as_data_frame(iris)[[ ,1]]
#> Error in `[[.tbl_df`(as_data_frame(iris), , 1): argument "i" is missing, with no default

Why does this "work"?

as_data_frame(iris)[[1, ]]
#> [1] 5.1

The plot thickens

library(tibble)
mtcars[["Lotus Europa", "mpg"]]
#> [1] 30.4

Why the message about a column?

as_data_frame(mtcars)[["Lotus Europa", "mpg"]]
#> Error: Unknown column 'Lotus Europa'

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