R Under development (unstable) (2023-12-04 r85659 ucrt) -- "Unsuffered Consequences"
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> # See https://github.com/r-lib/testthat/issues/86
> Sys.setenv("R_TESTS" = "")
> 
> library(testthat)
> library(later)
> 
> test_check("later")
Error in (function (..., .x = ..1, .y = ..2, . = ..1)  : boom
Error in (function ()  : no function to return from, jumping to top level
Error in (function ()  : no function to return from, jumping to top level
[ FAIL 0 | WARN 0 | SKIP 2 | PASS 121 ]

══ Skipped tests (2) ═══════════════════════════════════════════════════════════
• On CRAN (2): 'test-private-loops.R:373:3', 'test-run_now.R:156:3'

[ FAIL 0 | WARN 0 | SKIP 2 | PASS 121 ]
> 
> proc.time()
   user  system elapsed 
   3.15    0.28   47.12