On Windows, if it needs to, Stack downloads and installs a copy of MSYS2 to its ‘programs’ directory (stack path --programs). I’ve just bumped that version to msys2-20220904, from msys2-20220503.
It appears that the previous archive for msys2-20220503 (set up in May) could not be unpacked unless the terminal had elevated rights (‘Run as administrator’) due to symlinks in the archive. This problem could result in large temporary directories building up in Stack’s ‘programs’ directory, which can be safely deleted. See Stack issue #5904. The archive for msys2-20220904 should not have that problem.
