https://bugs.winehq.org/show_bug.cgi?id=43135
--- Comment #3 from zefkerr zefkerrigan@gmail.com --- (In reply to Michael Müller from comment #2)
Not a Wine Staging regression, but a bug in Wine which currently only appears when using GCC 7 as compiler. Arch Linux compiled the development version using GCC 6 and Wine Staging using GCC 7, so one could think this is a Wine Staging regression.
*** This bug has been marked as a duplicate of bug 43127 ***
Thank you for your reply!