https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93286
--- Comment #1 from Bernd Edlinger <edlinger at gcc dot gnu.org> --- with the following command it started already earlier: gcc -Wshadow-compatible-local -fmax-errors=1 -std=c++17 -c effect.ii
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93286
--- Comment #1 from Bernd Edlinger <edlinger at gcc dot gnu.org> --- with the following command it started already earlier: gcc -Wshadow-compatible-local -fmax-errors=1 -std=c++17 -c effect.ii