https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103706
--- Comment #6 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:34ba3d9a2bf72742b1c150a2dd17d10e3e3f0964 commit r12-7101-g34ba3d9a2bf72742b1c150a2dd17d10e3e3f0964 Author: Patrick Palka <ppa...@redhat.com> Date: Tue Feb 8 08:46:13 2022 -0500 c++: constrained auto in lambda using outer tparms [PR103706] Here we're crashing during satisfaction of the lambda's placeholder type constraints because the constraints depend on the template arguments from the enclosing scope, which aren't part of the lambda's DECL_TI_ARGS. This patch fixes this by making do_auto_deduction consider the "regenerating" template arguments of a lambda for satisfaction, mirroring what's done in satisfy_declaration_constraints. PR c++/103706 gcc/cp/ChangeLog: * constraint.cc (satisfy_declaration_constraints): Use lambda_regenerating_args instead. * cp-tree.h (lambda_regenerating_args): Declare. * pt.cc (lambda_regenerating_args): Define, split out from satisfy_declaration_constraints. (do_auto_deduction): Use lambda_regenerating_args to obtain the full set of outer template arguments for satisfaction when inside a lambda. gcc/testsuite/ChangeLog: * g++.dg/cpp2a/concepts-lambda18.C: New test.
