https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105541
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jason Merrill <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:88459c3965e2a2f62ab4d4c8b2ac8460b1a15c33 commit r13-332-g88459c3965e2a2f62ab4d4c8b2ac8460b1a15c33 Author: Jason Merrill <ja...@redhat.com> Date: Wed May 11 14:53:26 2022 -0400 c++: lambda template in requires [PR105541] Since the patch for PR103408, the template parameters for the lambda in this test have level 1 instead of 2, and we were treating null template args as 1 level of arguments, so tsubst_template_parms decided it had nothing to do. Fixed by distinguishing between <> and no args at all, which is what we have in our "substitution" in a requires-expression. PR c++/105541 gcc/cp/ChangeLog: * cp-tree.h (TMPL_ARGS_DEPTH): 0 for null args. * parser.cc (cp_parser_enclosed_template_argument_list): Use 0-length TREE_VEC for <>. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/lambda-requires1.C: New test.
