Nightly Dotty workflow of 2022-05-21 failed

[github-actions]

See https://github.com/lampepfl/dotty/actions/runs/2361734322

[bishabosha]

Failed due to #15241

Looks like the current windows environment does not support -S flag for the env tool, but @philwalk says it should be available in a more recent version

[philwalk]

The installed coreutils version can be displayed via:

$ cygcheck -f /usr/bin/env

The current default version installed by the cygwin installer is: coreutils-8.26-2.

The -S flag is not supported on cygwin earlier than version coreutils-8.32-1.
Because it's not the default version, it must be explicitly selected.
It shows up as version 8.32-1-TEST in the pull-down menu of the installer on my system.

Perhaps we need two versions of each of the affected test scripts, one for macos, the other for everything else.

The relevant change in BashScriptsTests.scala lines 199-200 might be:

197   @Test def sqlDateTest =
198     val scriptBase = "sqlDateError"
199     val scriptFilename = if (ostype == "darwin") s"$scriptBase-darwin.sc" else s"$scriptBase.sc"
200     val scriptFile = testFiles.find(_.getName == scriptFilename).get

[philwalk]

The problem on macos that this change was intended to fix, if I understand it correctly, is due to the fact that osx doesn't allow hashbang lines to call scripts, but only supports referencing a binary executable.