R Under development (unstable) (2023-08-05 r84874 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> print_cargo <- function(){
+   home <- Sys.getenv(ifelse(.Platform$OS.type == 'windows', 'USERPROFILE', 'HOME'))
+   cargodir <- file.path(home, '.cargo', 'bin')
+   Sys.setenv(PATH = paste(cargodir, Sys.getenv('PATH'), sep = .Platform$path.sep))
+   cargo <- Sys.which('cargo')
+   if(nchar(cargo)){
+     cat("Found cargo in:", cargo, "\n")
+     system("cargo --version", wait = TRUE)
+   } else {
+     cat("Cargo not found on the path\n")
+   }
+   invisible()
+ }
> print_cargo()
Found cargo in: C:\Users\CRAN\CARGO~1\bin\cargo.exe 
cargo 1.69.0 (6e9a83356 2023-04-12)
> 
> proc.time()
   user  system elapsed 
   0.14    0.04    0.23