roxygen2:::tokenise_block() causes "vector memory limit reached" error when RMariaDB package is loaded

[uhkeller]

When the RMariaDB package is loaded before calling roxygen2:::tokenise_block(), the call results in a "vector memory limit reached" error. When tokenise_block() has already been called before RMariaDB is loaded, subsequent calls to it do not produce this error. I can reproduce this 100% of the time in both RStudio and Positron.

library(RMariaDB)

roxygen2:::tokenise_block(
  "#' Some text
#' @export
fun <- function(x) x",
  "test.R",
  offset = 1
)
#> Error: vector memory limit of 32.0 Gb reached, see mem.maxVSize()

^{Created on 2024-11-11 with reprex v2.1.1}

R version 4.4.2 (2024-10-31)
Platform: aarch64-apple-darwin20
Running under: macOS Sequoia 15.1

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib 
LAPACK: /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/lib/libRlapack.dylib;  LAPACK version 3.12.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

time zone: Europe/Berlin
tzcode source: internal

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] RMariaDB_1.3.2

loaded via a namespace (and not attached):
 [1] R6_2.5.1          bit_4.5.0         xfun_0.49         magrittr_2.0.3    glue_1.8.0        stringr_1.5.1     knitr_1.49       
 [8] pkgconfig_2.0.3   bit64_4.5.2       lifecycle_1.0.4   xml2_1.3.6        cli_3.6.3         DBI_1.2.3         vctrs_0.6.5      
[15] compiler_4.4.2    purrr_1.0.2       rstudioapi_0.17.1 tools_4.4.2       hms_1.1.3         evaluate_1.0.1    rlang_1.1.4      
[22] roxygen2_7.3.2    stringi_1.8.4