https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117231
--- Comment #3 from Iain Sandoe <iains at gcc dot gnu.org> --- with my local patches (which I will ping this week) I see: $ ./gcc/xg++ -Bgcc -std=c++2c /src-local/cxx-coroutines/gcc/testsuite/g++.dg/coroutines/pr117231.C -o t ./t 1 2 3 So this is possibly a non-obvious dup.