address error on devtools::document()

[simonpcouch]

Seeing:

> devtools::document()
Error in `map2()`:
ℹ In index: 1.
ℹ With name: fit.probability_threshold.
Caused by error in `basename()`:
! a character vector argument expected
---
Backtrace:
     ▆
  1. └─devtools::document()
  2.   └─roxygen2::roxygenise(pkg$path, roclets)
  3.     └─base::lapply(...)
  4.       ├─roxygen2 (local) FUN(X[[i]], ...)
  5.       └─roxygen2:::roclet_process.roclet_namespace(X[[i]], ...)
  6.         └─roxygen2:::warn_missing_s3_exports(blocks, env)
  7.           └─purrr::map2(...)
  8.             └─purrr:::map2_("list", .x, .y, .f, ..., .progress = .progress)
  9.               ├─purrr:::with_indexed_errors(...)
 10.               │ └─base::withCallingHandlers(...)
 11.               ├─purrr:::call_with_cleanup(...)
 12.               └─roxygen2 (local) .f(.x[[i]], .y[[i]], ...)
 13.                 └─roxygen2:::warn_roxy_function(fun, "S3 method {.arg {name}} needs @export or @exportS3method tag")

Strangely, this isn't an issue if I backdate my roxygen2 to 7.2.3. I suppose we can go ahead and export S3 methods and see if that resolves :)

[simonpcouch]

Bizarre... the first devtools::document() in a fresh session runs fine, the second results in the failure.

Also see:

Warning message:
In class(f) <- c("s3method", "function") :
  Setting class(x) to multiple strings ("s3method", "function", ...); result will no longer be an S4 object

[simonpcouch]

Ah, see r-lib/roxygen2#1589. I had set a breakpoint inside the noted function—once I removed it, the error went away. Weird.