group-map.md
In dplyr: A Grammar of Data Manipulation

group_map() give meaningful errors

Code
  (expect_error(group_modify(group_by(mtcars, cyl), ~ data.frame(cyl = 19))))
Output
  <error/rlang_error>
  Error in `group_modify()`:
  ! The returned data frame cannot contain the original grouping variables: cyl.
Code
  (expect_error(group_modify(group_by(mtcars, cyl), ~10)))
Output
  <error/rlang_error>
  Error in `group_modify()`:
  ! The result of `.f` must be a data frame.
Code
  (expect_error(group_modify(group_by(iris, Species), head1)))
Output
  <error/rlang_error>
  Error in `group_modify()`:
  ! `.f` must accept at least two arguments.
  i You can use `...` to absorb unused components.
Code
  (expect_error(group_map(group_by(iris, Species), head1)))
Output
  <error/rlang_error>
  Error in `group_map()`:
  ! `.f` must accept at least two arguments.
  i You can use `...` to absorb unused components.

`keep =` is defunct

Code
  group_map(df, keep = TRUE)
Condition
  Error:
  ! The `keep` argument of `group_map()` was deprecated in dplyr 1.0.0 and is now defunct.
  i Please use the `.keep` argument instead.

Code
  group_map(gdf, keep = TRUE)
Condition
  Error:
  ! The `keep` argument of `group_map()` was deprecated in dplyr 1.0.0 and is now defunct.
  i Please use the `.keep` argument instead.

Code
  group_modify(df, keep = TRUE)
Condition
  Error:
  ! The `keep` argument of `group_modify()` was deprecated in dplyr 1.0.0 and is now defunct.
  i Please use the `.keep` argument instead.

Code
  group_modify(gdf, keep = TRUE)
Condition
  Error:
  ! The `keep` argument of `group_modify()` was deprecated in dplyr 1.0.0 and is now defunct.
  i Please use the `.keep` argument instead.