Errors in mask methods carry wrong calls

[lionel-]

CRAN rlang doesn't display calls of the form foo$fn(). Dev rlang now does, which reveals a few call problems in the error snapshots, for instance:

tibble() %>% summarise(stop("{"))
#> Error in `summarise()`:
#> ! Problem while computing `..1 = stop("{")`.
#> Caused by error in `mask$eval_all_summarise()`:
#> ! {

tbl <- tibble(x = 1:2, y = 1:2)
tbl %>%
  group_by(x) %>%
  mutate(y = NULL, a = sum(y))
#> Error in `mutate()`:
#> ! Problem while computing `a = sum(y)`.
#> ℹ The error occurred in group 1: x = 1.
#> Caused by error in `mask$eval_all_mutate()`:
#> ! object 'y' not found