R Under development (unstable) (2026-01-19 r89308 ucrt) -- "Unsuffered Consequences"
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> library(testthat)
> library(cpp11)
> 
> test_check("cpp11")
[ FAIL 0 | WARN 0 | SKIP 6 | PASS 103 ]

══ Skipped tests (6) ═══════════════════════════════════════════════════════════
• On CRAN (5): 'test-register.R:52:3', 'test-register.R:66:3',
  'test-register.R:508:3', 'test-register.R:536:3', 'test-source.R:221:1'
• On Windows (1): 'test-source.R:70:3'

[ FAIL 0 | WARN 0 | SKIP 6 | PASS 103 ]
> 
> proc.time()
   user  system elapsed 
   3.81    0.90   43.29