https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103408
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The trunk branch has been updated by Marek Polacek <mpola...@gcc.gnu.org>: https://gcc.gnu.org/g:6f43a8a08053a871e785e2ebc80383e0849efb6f commit r12-5710-g6f43a8a08053a871e785e2ebc80383e0849efb6f Author: Marek Polacek <pola...@redhat.com> Date: Tue Nov 30 16:43:19 2021 -0500 c++: ICE with unnamed tparm and concept [PR103408] Here we crash when issuing the "constraint C has type T, not bool" error, because pp_cxx_parameter_mapping wasn't prepared to see an anonymous template parameter. With this patch we print error: constraint 'auto(<lambda>) [with <unnamed> = 0]' has type '<lambda()>', not 'bool' The "<unnamed>" is what this patch adds. PR c++/103408 gcc/cp/ChangeLog: * cxx-pretty-print.c (pp_cxx_parameter_mapping): Print "<unnamed>" rather than crash on an unnamed template parameter. gcc/testsuite/ChangeLog: * g++.dg/cpp23/concepts-err1.C: New test.
