R Under development (unstable) (2024-07-02 r86866 ucrt) -- "Unsuffered Consequences"
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> library(loo)
This is loo version 2.8.0
- Online documentation and vignettes at mc-stan.org/loo
- As of v2.0.0 loo defaults to 1 core but we recommend using as many as possible. Use the 'cores' argument or set options(mc.cores = NUM_CORES) for an entire session. 
- Windows 10 users: loo may be very slow if 'mc.cores' is set in your .Rprofile file (see https://github.com/stan-dev/loo/issues/94).
> library(testthat)

Attaching package: 'testthat'

The following object is masked from 'package:loo':

    compare

> Sys.setenv("R_TESTS" = "")
> test_check("loo")
[ FAIL 0 | WARN 0 | SKIP 5 | PASS 981 ]

══ Skipped tests (5) ═══════════════════════════════════════════════════════════
• On CRAN (5): 'test_loo_subsampling.R:732:3', 'test_loo_subsampling.R:841:3',
  'test_loo_subsampling.R:1001:3', 'test_loo_subsampling.R:1085:3',
  'test_relative_eff.R:40:3'

[ FAIL 0 | WARN 0 | SKIP 5 | PASS 981 ]
> 
> proc.time()
   user  system elapsed 
  42.06    1.93   46.15