Uncaught errors should show class

[hadley]

And maybe other fields if they exist?

library(testthat)
library(rlang)

test_that("uncaught error shows class", {
  abort("Hi!", class = "foobar")
})
#> ── Error (<text>:5:3): uncaught error shows class ──────────────────────────────
#> Error: Hi!

^{Created on 2021-08-18 by the reprex package (v2.0.0)}