Collapse duplicated messages somehow?

[hadley]

I just saw this error

Cannot install packages:
  * local::.: Can't install dependency r-lib/rlang
  * r-lib/rlang: GitHub HTTP error
  * bslib: Can't install dependency rlang
  * rlang: Conflicts with r-lib/rlang
  * cachem: Can't install dependency rlang
  * ellipsis: Can't install dependency rlang
  * htmltools: Can't install dependency rlang
  * lifecycle: Can't install dependency rlang
  * memoise: Can't install dependency rlang
  * pillar: Can't install dependency rlang
  * pkgload: Can't install dependency rlang
  * purrr: Can't install dependency rlang
  * sass: Can't install dependency rlang
  * testthat: Can't install dependency rlang
  * tibble: Can't install dependency rlang
  * vctrs: Can't install dependency rlang
  * waldo: Can't install dependency rlang
  * r-lib/downlit: Can't install dependency rlang

And it took me a second to see the root cause because of all the duplicated "can't install dependency" errors

[gaborcsardi]

Yeah, we could post-process this, at least in the simple cases like this.