https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110242
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> --- We're trying to emit the "no return statement in function returning non-void" warning, which triggers dump_template_bindings: 493 push_deferring_access_checks (dk_no_check); 494 t = tsubst (t, args, tf_none, NULL_TREE); 495 pop_deferring_access_checks (); The tsubst leads to tsubst_lambda_expr with complain=tf_none, but there we have 19748 tree body = start_lambda_function (fn, r); which has no complain, and in it, push_template_decl warns about 5883 warning (OPT_Wtemplates, "template %qD declared", decl); so we crash.
