No such keg: /opt/homebrew/Cellar/[email protected]" using setup-r@v2 for MacOS latest

[petelaud]

Similar to #864, the R-CMD-check workflow here is reported as being successful but also produces the error "macOS-latest (release) No such keg: /opt/homebrew/Cellar/[email protected]" as can be seen here.

Seems like it's trying to 'unlink' something that isn't there?:

Downloading macOS utils
/opt/homebrew/bin/brew unlink [email protected]
Error: No such keg: /opt/homebrew/Cellar/[email protected]
/opt/homebrew/bin/brew install qpdf pkgconfig checkbashisms ghostscript
Warning: pkgconf 2.3.0_1 is already installed and up-to-date.

[salim-b]

Maybe we could instead run

if brew unlink --dry-run [email protected] ; then
  brew unlink [email protected]
fi

to avoid the error?

Cf. https://docs.brew.sh/Manpage#unlink---dry-run-installed_formula-