vars_pull() doesn't scope in helpers

[hadley]

tidyselect::vars_pull(letters, any_of("x"))
#> Error in any_of("x"): could not find function "any_of"

^{Created on 2020-01-14 by the reprex package (v0.3.0)}

[lionel-]

Is it clear that we want to scope them in? I guess it can be useful interactively when the user knows a queries can only return one variable. I'm not sure any_of() makes sense in a pull context though, since it's mandatory to return one variable. I was thinking it could be helpful to have an any-of- or all-of-like helper for selecting exactly one variable.

[lionel-]

Not sure this makes much sense but it works now:

dplyr::pull(mtcars, .data[["cyl"]])
#>  [1] 6 6 4 6 8 6 8 4 4 6 6 8 8 8 8 8 8 4 4 4 4 8 8 8 8 4 4 4 8 6 8 4

[hadley]

Yeah, I think pull is really yet another minor variation on tidyselect since it also uses negative values to index from the RHS.