https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96926
Jason Merrill <jason at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|[9/10/11 Regression] Tuple |[9/10 Regression] Tuple |element w/ member reference |element w/ member reference |to incomplete template type |to incomplete template type |rejected |rejected --- Comment #9 from Jason Merrill <jason at gcc dot gnu.org> --- Fixed for GCC 11. I want to give this one a lot of time before backporting.