Include examples of named any_of()/all_of()

[hadley]

tidyverse/dplyr#6644

[mike-duran-mitchell]

First of all, I absolutely appreciate that these examples were added because debugging a large script with the .groups message is pure hell without it explicitly showing where it occurred. More examples for deprecations or warnings like this, please!!! Additionally, it'd be nice to make this example a little more clear. For example, my code is:

cols_to_select <- c('col1', 'col2', col3')
subset_df <- df %>% select(-cols_to_select)

But the warning message doesn't indicate where the - sign goes. My suggestion would be just to add it in below so that it's in front of all_of() in the below example when the deprecation warning is thrown. Not really the hardest curveball for me to knock out of the park, but I can imagine newer users would feel a little confused about whether to stick the - inside or outside of all_of().

Warning message:
Using an external vector in selections was deprecated in tidyselect 1.1.0.
ℹ Please use `all_of()` or `any_of()` instead.
  # Was:
  data %>% select(cols_to_select)

  # Now:
  data %>% select(all_of(cols_to_select))

See <https://tidyselect.r-lib.org/reference/faq-external-vector.html>.
This warning is displayed once every 8 hours.
Call `lifecycle::last_lifecycle_warnings()` to see where this warning was generated. 

I got it right the first time using select(-all_of(cols_to_select)) but I also wanted to confirm the function is not agnostic regarding the placement of - and it does throw an error:

Error in `dplyr::select()`:
! Problem while evaluating `all_of(-cols_to_select)`.
Caused by error in `-cols_to_select`:
! invalid argument to unary operator
Run `rlang::last_trace()` to see where the error occurred.

[lionel-]

Closed by #356.