R 奇怪的可视化打印包

我运行了样例代码，但得到了一个相当奇怪的可视化效果

library("lobstr") 

ast(a + b + c)
o-`+` 
+-o-`+` 
| +-a 
| \-b 
\-c 

但从here个例子来看，我应该会得到一个不同的结果

ast(a + b + c)
#> █─`+` 
#> ├─█─`+` 
#> │ ├─a 
#> │ └─b 
#> └─c

What's wrong?个

sessionInfo()



R version 4.3.0 (2023-04-21 ucrt)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

Matrix products: default


time zone: Europe/Kiev
tzcode source: internal

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

other attached packages:
[1] lobstr_1.1.2

loaded via a namespace (and not attached):
[1] compiler_4.3.0    cli_3.6.1         tools_4.3.0       rstudioapi_0.15.0
[5] crayon_1.5.2      rlang_1.1.1 

= 罗兰德的更新

unclass(ast(a + b + c))

[1] "\033[38;5;214mo\033[39m-\033[1m\033[35m`+`\033[39m\033[22m"  
[2] "+-\033[38;5;214mo\033[39m-\033[1m\033[35m`+`\033[39m\033[22m"
[3] "| +-\033[1m\033[35ma\033[39m\033[22m"                        
[4] "| \\-\033[1m\033[35mb\033[39m\033[22m"                       
[5] "\\-\033[1m\033[35mc\033[39m\033[22m"

= 下面的更新是您要求l10n_info()的此函数的输出

    $MBCS
    [1] FALSE
    
    $`UTF-8`
    [1] FALSE
    
    $`Latin-1`
    [1] FALSE
    
    $codepage
    [1] 1251
    
    $system.codepage
    [1] 1251