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registerDoParallel does not fail because it never initiates cores #11

Description

@muschellij2

Maybe an initiation of cores at

# register multicore backend
would trigger "correct" errors vs. silent errors.

doParallel::registerDoParallel(cores = n_cores)
#> <simpleError in eval(expr, envir): object 'n_cores' not found>

Created on 2025-05-13 with reprex v2.1.1

Session info

sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#>  setting  value
#>  version  R version 4.4.0 (2024-04-24)
#>  os       macOS 15.4.1
#>  system   x86_64, darwin20
#>  ui       X11
#>  language (EN)
#>  collate  en_US.UTF-8
#>  ctype    en_US.UTF-8
#>  tz       America/New_York
#>  date     2025-05-13
#>  pandoc   3.6.4 @ /usr/local/bin/ (via rmarkdown)
#> 
#> ─ Packages ───────────────────────────────────────────────────────────────────
#>  package     * version date (UTC) lib source
#>  cli           3.6.3   2024-06-21 [1] CRAN (R 4.4.0)
#>  codetools     0.2-20  2024-03-31 [1] CRAN (R 4.4.0)
#>  digest        0.6.37  2024-08-19 [1] CRAN (R 4.4.1)
#>  doParallel    1.0.17  2022-02-07 [1] CRAN (R 4.4.0)
#>  evaluate      1.0.3   2025-01-10 [1] CRAN (R 4.4.1)
#>  fastmap       1.2.0   2024-05-15 [1] CRAN (R 4.4.0)
#>  foreach       1.5.2   2022-02-02 [1] CRAN (R 4.4.0)
#>  fs            1.6.5   2024-10-30 [1] CRAN (R 4.4.1)
#>  glue          1.8.0   2024-09-30 [1] CRAN (R 4.4.1)
#>  htmltools     0.5.8.1 2024-04-04 [1] CRAN (R 4.4.0)
#>  iterators     1.0.14  2022-02-05 [1] CRAN (R 4.4.0)
#>  knitr         1.49    2024-11-08 [1] CRAN (R 4.4.1)
#>  lifecycle     1.0.4   2023-11-07 [1] CRAN (R 4.4.0)
#>  reprex        2.1.1   2024-07-06 [1] CRAN (R 4.4.0)
#>  rlang         1.1.5   2025-01-17 [1] CRAN (R 4.4.1)
#>  rmarkdown     2.29    2024-11-04 [1] CRAN (R 4.4.1)
#>  rstudioapi    0.17.1  2024-10-22 [1] CRAN (R 4.4.1)
#>  sessioninfo   1.2.2   2021-12-06 [1] CRAN (R 4.4.0)
#>  withr         3.0.2   2024-10-28 [1] CRAN (R 4.4.1)
#>  xfun          0.50    2025-01-07 [1] CRAN (R 4.4.1)
#>  yaml          2.3.10  2024-07-26 [1] CRAN (R 4.4.0)
#> 
#>  [1] /Library/Frameworks/R.framework/Versions/4.4-x86_64/Resources/library
#> 
#> ──────────────────────────────────────────────────────────────────────────────

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