Error(s) in re-building vignettes:
  ...
--- re-building ‘rvest-benchmarks.Rmd’ using rmarkdown
** Processing: /home/hornik/tmp/R.check/r-release-gcc/Work/PKGS/readMDTable.Rcheck/vign_test/readMDTable/vignettes/rvest-benchmarks_files/figure-html/benchmark-1-1.png
864x288 pixels, 8 bits/pixel, 255 colors in palette
Reducing image to 8 bits/pixel, grayscale
Input IDAT size = 10896 bytes
Input file size = 11763 bytes

Trying:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 9351
  zc = 9  zm = 8  zs = 1  f = 0
  zc = 1  zm = 8  zs = 2  f = 0
  zc = 9  zm = 8  zs = 3  f = 0
  zc = 9  zm = 8  zs = 0  f = 5
  zc = 9  zm = 8  zs = 1  f = 5
  zc = 1  zm = 8  zs = 2  f = 5
  zc = 9  zm = 8  zs = 3  f = 5
                               
Selecting parameters:
  zc = 9  zm = 8  zs = 0  f = 0		IDAT size = 9351

Output IDAT size = 9351 bytes (1545 bytes decrease)
Output file size = 9429 bytes (2334 bytes = 19.84% decrease)


Quitting from rvest-benchmarks.Rmd:61-72 [benchmark-2]
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<error/rlang_error>
Error in `open.connection()`:
! cannot open the connection
---
Backtrace:
     ▆
  1. ├─microbenchmark::microbenchmark(...)
  2. └─global test_rvest(mtcars_html_url)
  3.   ├─rvest::html_table(rvest::read_html(content))
  4.   ├─rvest::read_html(content)
  5.   └─xml2:::read_html.default(content)
  6.     ├─base::suppressWarnings(...)
  7.     │ └─base::withCallingHandlers(...)
  8.     ├─xml2::read_xml(x, encoding = encoding, ..., as_html = TRUE, options = options)
  9.     └─xml2:::read_xml.character(...)
 10.       └─xml2:::read_xml.connection(...)
 11.         ├─base::open(x, "rb")
 12.         └─base::open.connection(x, "rb")
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Error: processing vignette 'rvest-benchmarks.Rmd' failed with diagnostics:
cannot open the connection
--- failed re-building ‘rvest-benchmarks.Rmd’

SUMMARY: processing the following file failed:
  ‘rvest-benchmarks.Rmd’

Error: Vignette re-building failed.
Execution halted