https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97704
--- Comment #3 from gcc-bugs at marehr dot dialup.fu-berlin.de --- Thank you, Marek Polacek for finding that revision. I checked out the master branch and reverted the commit f1612b8ae8a60f62cf5456b3357a341550534a7e and now everything compiles again. So that, regression is definitely coming from that commit.
