https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105418
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jason at gcc dot gnu.org --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- you don't include enough of the backtrace to see where debug_tree comes into the picture (or decl_as_string FWIW). Certainly we shouldn't tsubst from debug_tree, so maybe there's something that can be done in the C++ FE here.