https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94808
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>: https://gcc.gnu.org/g:43439d5e8424f3a746003ef8953e1cdc120fbbd7 commit r10-8024-g43439d5e8424f3a746003ef8953e1cdc120fbbd7 Author: Patrick Palka <ppa...@redhat.com> Date: Tue Apr 28 21:45:54 2020 -0400 c++: Parameter pack in requires parameter list [PR94808] When printing the substituted parameter list of a requires-expression as part of the "in requirements with ..." context line during concepts diagnostics, we weren't considering that substitution into a parameter pack can yield zero or multiple parameters. This patch changes the way we print the parameter list of a requires-expression in print_requires_expression_info. We now print the dependent form of the parameter list (along with its template parameter mapping) instead of printing its substituted form. Besides being an improvement in its own, this also sidesteps the substitution issue in the PR altogether. gcc/cp/ChangeLog: PR c++/94808 * error.c (print_requires_expression_info): Print the dependent form of the parameter list with its template parameter mapping, rather than printing the substituted form. gcc/testsuite/ChangeLog: PR c++/94808 * g++.dg/concepts/diagnostic12.C: New test. * g++.dg/concepts/diagnostic5.C: Adjust dg-message.
