https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83997
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> --- bu11.cc:10:1: internal compiler error: tree code 'template_parm_index' is not supported in LTO streams this usually means FE tree codes leak somehow into the middle-end there's a free_lang_data langhook for the FE to prune these from types/decls when needed.
