`case_when()` error path isn't working correctly

[DavisVaughan]

library(dplyr)

# check_type
case_when(TRUE ~ 1, TRUE ~ "x")
#> Error in names(message) <- `*vtmp*`: 'names' attribute [1] must be the same length as the vector [0]

# check_class
case_when(TRUE ~ 1, TRUE ~ structure(1, class = "foo"))
#> Error in names(message) <- `*vtmp*`: 'names' attribute [1] must be the same length as the vector [0]

These are supposed to report on invalid types and classes, respectively.

This happens because we are missing an argument here in replace_with(). That NULL is probably intended to be passed on to reason, but it is instead being matched to name and that doesn't work. A character name is required for that error path to run correctly.

dplyr/R/case_when.R

Line 174 in 1cff4b9

out <- replace_with(out, query[[i]] & !replaced, value[[i]], NULL, error_call = error_call)

[eutwt]

Causing #6206

[DavisVaughan]

Introduced by #6052 when there was an internal switch from glubort() to abort() in check_type() and friends
https://github.com/tidyverse/dplyr/pull/6052/files#diff-84f715c580f8ab258e33d9d80e0eb0f8e24cb2c1a66b9c28c6abe51c52f99f54R54

We now do:

msg <- glue("{header} must be {friendly_type_of(template)}, not {friendly_type_of(x)}.")
abort(msg, call = error_call)

Where header could be NULL, causing the issue.

We used to do:

glubort(header, "must be {friendly_type_of(template)}, not {friendly_type_of(x)}.")

Where glubort() was:

glubort <- function(header, ..., .envir = parent.frame(), .abort = abort) {
   text <- glue(..., .envir = .envir)
   if (!is_null(header)) text <- paste0(header, " ", text)
   .abort(text)
 }

The previous code wouldn't give the best result, but it would at least kind of work (this is dplyr 1.0.0):

> case_when(TRUE ~ 1, TRUE ~ "x")
Error in `glubort()`:
! must be a double vector, not a character vector.
Run `rlang::last_error()` to see where the error occurred.