https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95735
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:5421fae8b17c7401f3a4ac5b9f414a47f7bda379 commit r11-1516-g5421fae8b17c7401f3a4ac5b9f414a47f7bda379 Author: Marek Polacek <pola...@redhat.com> Date: Thu Jun 18 09:38:42 2020 -0400 c++: ICE in requires-expressions with invalid args [PR95735] This ICE-on-invalid goes back to GCC 6. In finish_template_variable, if coerce_innermost_template_parms returns error_mark_node, we pass it down to constraints_satisfied_p and that error_mark_node flows down to various satisfy_* functions and then to various tsubst_* functions, where we crash. diagnose_constraints also doesn't cope with error arglist, so I think we should just return as in the patch below. gcc/cp/ChangeLog: PR c++/95735 * pt.c (finish_template_variable): Return if coerce_innermost_template_parms return error_mark_node. gcc/testsuite/ChangeLog: PR c++/95735 * g++.dg/cpp2a/concepts-err2.C: New test.
