R version 4.6.0 RC (2026-04-21 r89932 ucrt) -- "Because it was There"
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Platform: x86_64-w64-mingw32/x64

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> library(testthat)
> library(Immutables)
> 
> # testthat/waldo uses temporary language switching for stable output.
> # If LC_ALL is pinned, this emits noisy warnings on every expectation.
> Sys.unsetenv("LC_ALL")
> 
> test_check("Immutables")
[ FAIL 0 | WARN 0 | SKIP 16 | PASS 1323 ]

══ Skipped tests (16) ══════════════════════════════════════════════════════════
• On CRAN (16): 'test-cpp-gc-safety.R:152:3', 'test-cpp-gc-safety.R:158:3',
  'test-cpp-gc-safety.R:166:3', 'test-cpp-gc-safety.R:170:3',
  'test-cpp-gc-safety.R:174:3', 'test-cpp-gc-safety.R:183:3',
  'test-cpp-gc-safety.R:189:3', 'test-print.R:9:1', 'test-print.R:17:1',
  'test-print.R:23:1', 'test-print.R:44:1', 'test-print.R:59:1',
  'test-print.R:69:1', 'test-print.R:82:1', 'test-print.R:92:1',
  'test-print.R:108:1'

[ FAIL 0 | WARN 0 | SKIP 16 | PASS 1323 ]
> 
> proc.time()
   user  system elapsed 
  93.46    3.87   97.65